Tips & Help For COROS Watches

GPS, HR & Other Sensors

It depends and most likely the answer is no. Tattoos will absorb the signal emitted from optical wrist-based heart rate sensors on GPS watches. Depending on the color and pattern of the tattoos, COROS watches may or may not be able to generate valid heart rate readings.

In the past a few days, some users have reported problems with slow or failed GPS connection. The COROS team has found the root cause of the problem.
 
Cause of the problem:
Your COROS watch relies on up-to-date satellite data for faster and reliable GPS connection. The GPS satellite data downloaded on the leap day, Feb 29th 2020, was mistakenly labeled as Feb 29th 2021. As a result, when the GPS satellite data expired after 7 days on March 7th, the subsequent GPS satellite data was considered outdated and was not able to help with GPS connection.
 
Our engineers have been working hard and released a firmware update on March 10th to fix the problem. Please apply the new firmware update and tap on “GPS Satellite Data” on the Device page to update the GPS data to your watch. 
 
Our sincere apologies for the inconvenience caused for users around the world and appreciate everyone in helping us find the problem and continuing to trust our products.
 

Intelligent Stride Algorithm

Some users noticed that the pace and distance data of their usual runs remain accurate even though the GPS connection was weak or missing. The reason why COROS watches are able to provide a fairly accurate pace and distance tracking without GPS connection is because of our unique machine-learning intelligent stride algorithm. 

Every outdoor run with GPS connection and indoor run with post-workout calibration help build your very own stride model that will be used for indoor running or areas of weak GPS signal (such as tunnels). 

All COROS watches are equipped with a wrist-based optical heart rate ( OHR ) sensor providing a convenient way to monitor Heart Rate without additional accessories. Therefore, athletes can determine their training zones, overall training load and necessary recovery.

Optical heart rate sensors are generally considered as an estimate of your effort. Athletes following HR based training programs are recommended to use heart rate straps and armbands ( which can be paired to COROS watches via ANT+connection ). Here is why:

In the technology world, all sensors including OHR will receive two things: signal and noise. Signal includes everything that’s helpful to your sensor reading, while noise is what keeps disturbing your sensor from providing correct measurements. If the sensitivity of a sensor is enhanced, it often increases both the signal and noise, causing an imperfect result. Most HR chest straps are equipped with technologies to receive less noise and stronger signal resulting in superior heart rate tracking performance than OHR during interval training.

Optical HR sensors rely on the reflection of the remaining green light after certain light got absorbed by the blood under your skin to determine the pulse frequency. COROS watches have four OHR algorithms built in: running, cycling, swimming and interval running. They are customized to different types of workouts to give you the best accuracy possible. Since heart rate sensors worn on your wrist are more prone to noise interference, the wearer should take the following steps to increase the signal and reduce noise as much as possible.

Here is what you can do to increase the signal:

  • Keep your hands warm.
    The OHR signal comes from your blood reflection. So, the more blood flow you have, the better signal your watch will receive. The weather doesn’t need to be freezing to impact your OHR accuracy. As long as your hands feel cold, your blood flow is reduced significantly. The best way to solve this is to wear gloves. Another suggestion is always warm up your body ( and your hands ) before starting your workout in the winter.
  • Clean skin without heavy hair or tattoos.
    It’s not a surprise that heavy hair and/or tattoos block the light refection and cause issues. If you have a tattoo ( s ) on one of your wrists, it is recommended that you switch your watch to the other one.
  • Wear the watch higher than your wrist bone.
    This is useful especially for those who have skinny wrists, as you need to find the areas of skin with more blood flow in order to properly use the OHR.
  • Wait for your watch to display a stable HR reading.
    Just like your body, your OHR sensor requires some warm-up too. It’s recommended to stay on the “Start” page and wait a little longer so the watch can filter some noise by itself. Our watches also provide an alert beep to let you know when it’s ready to go ( if sounds are turned off, you will see a heart symbol which will be solid and steady when ready ).
  • Select the proper training mode.
    The regular running, cycling and swimming algorithms are not specifically built for tracking rapid changes in heart rate. When you train with intervals, please select the Interval Training mode under Run mode for enhanced heart rate tracking sensitivity.

Here is what you can do to reduce noise:

  • Wear it tight.
    The shake from running cadence is one of the key factors that cause a discrepancy. You want to wear your watch as tight as possible yet is still comfortable enough to limit the watch’s ability to move on your wrist. Athletes often find their watch OHR reading higher during aggressive downhill running because this is when you have the strongest steps.
  • Pick a lighter watch
    The heavier the watch is, the stronger the noise that will be created from your running stride. Generally, a lighter watch will maintain a stronger signal for a longer time.
  • Reset your OHR sensor in the middle of your run.
    Sweat/water will increase the chance of your watch moving on your wrist. So, it’s not a surprise if your OHR is working fine during the early stages of your run and becomes inaccurate later on. It could be that your hands got colder reducing blood flow, or your wrist had some sweat causing movement of the watch. Take your watch off, wipe your sweat and keep your wrist dry. Touch the OHR sensor to your running apparel instead of your skin so the reading goes away. Put it back on and resume your run. Most likely you will get a good reading again.
The bottom line is, if you are a data geek or going through heart rate training programs, it is definitely recommended to use chest straps or arm sensors for training. COROS watches are compatible with many 3rd party HR sensors with ANT+connection. Here are some external sensors that are commonly used by COROS wearers. Keep in mind using external sensors will increase the watch battery consumption as explained here.
  • Polar OH1
  • Polar H10
  • Garmin HRM Dual/Tri
  • Wahoo TICKR

COROS watches are equipped with standalone GPS modules to acquire the GPS signal individually. You don’t need to carry your phone during training for the watch to connect to GPS. Connecting to GPS on your COROS watch for the first time or traveled over 200 miles since your last GPS connection may take up to several minutes. The subsequent GPS connection should take less than 30 seconds on average. 

Please follow the steps listed below to ensure a fast GPS connection on your COROS watch. 

  • Update the GPS Satellite Data on the COROS app on a regular basis. 
    • COROS app > Device Page > tap on GPS Satellite Data. 
    • GPS Satellite Data is valid between 3 to 7 days on your COROS watch depending on the watch model. Expired data may cause GPS connection issues. 
  • Stand still in an open field away from buildings. 
  • Don’t start moving (running, cycling, swimming, etc) before GPS is fully acquired. 

If you have trouble updating the GPS Satellite Data on the COROS app and receive an error message “AGPS verification failed”, please follow the step listed below. 

  • Disable any connected VPN.
  • Switch the network on your phone (celluar/WiFi).
  • Please change the settings on your iPhone.
    • Settings > Safari > Clear History and Website Data.

OROS watches rely on the barometer for elevation readings. It converts the air pressure readings to elevation. Longer outdoor workouts are prone to be affected by changes of air pressure even if the elevation remains the same. 

Factors listed below may affect the elevation readings on the elevation widget.

  • Natural changes in the air pressure throughout the day
  • Weather changes
  • Pressurized environments
  • Heaters and air conditioners
  • Submerged in water

It is recommended to calibrate the elevation during daily tracking via GPS or manually input on a regular basis. COROS watches automatically calibrate the elevation using GPS during outdoor workouts to ensure the best accuracy. 

Please follow the step below to calibrate the elevation on your watch. 

  • Main watch face > Elevation widget > Press and hold the CONFIRM button > Use GPS | Enter Elevation. 
    • Make sure to stand in an open filed when calibrating the elevation using GPS for the best accuracy. 

Satellite conditions, weather, tall buildings, heavy tree coverage and other sources may interfere with the GPS signal and affect the GPS accuracy. Feel free to utilize the Satellite Signal feature and change the GPS mode to compare results. When GPS signal is weak or lost, COROS’ Intelligent Stride algorithm along with motion sensors will kick in to maintain a decent tracking accuracy. Every outdoor run and calibrated indoor run improves the algorithm to better track your next workout.

COROS watches use motion sensors to detect your arm’s movement and estimate your walking activities. Anything that affects your arm’s movement can impact the accuracy of the step counter, such as carrying groceries/phones/hiking poles, driving, etc.

GPS isn’t involved during daily activities tracking. As a result, COROS can’t provide a realistic estimation of your walking mileage.

The thermometer on your COROS watch is mainly used to measure the water temperature for swimming activities.

To receive an accurate reading of the air temperature, please take off your watch and let it sit still for 30 minutes.

The temperature will be affected by body heat if worn on your wrist or under the sleeve.

(Available on APEX Pro, VERTIX)

Altitude Mode

SpO2, peripheral capillary oxygen saturation, is an estimate of the amount of oxygen in the blood and measures the amount of oxygen-carrying hemoglobin in the blood. COROS watches calculate SpO2 mainly by emitting and absolving light passing through blood vessels. As the elevation increases, SpO2 will gradually decrease.

When the elevation is above 2500 meters, oxygen intake and blood oxygen saturation will decrease and may cause symptoms including acute altitude sickness and high-altitude pulmonary edema (HAPE). COROS measures SpO2, heart rate, elevation and other data to estimate altitude acclimation at certain altitude.

COROS development team successfully applied wrist based SpO2 detection technology on watches and achieved accuracy comparable to medical fingertip measurement when remain stable at the end of 2017. However, SpO2 data provides limited assistance to climbers without applicable indications and suggestions including altitude sickness risk analysis, altitude acclimation evaluation, and activity intensity suggestions.

COROS partnered with a sport university and utilized their labs to simulate high altitude environments. After extensive data collection, research, and development for over a year, COROS was able to develop an Altitude Acclimation Evaluation System. Through applying this system, individual altitude acclimation analysis coupled with real time measurements can provide sound and practical acclimation assistance and guides for climbers. COROS Altitude Acclimation Evaluation System collects the SpO2 data and evaluates the altitude acclimation level for climbers when the elevation is above 2500 meters. Climbers are given more quantified and accurate info and under real time monitoring and notifications to effectively prevent altitude sickness.

Based on the indicated zones, Altitude Acclimation Index helps climbers plan out activities accordingly.

  • When Altitude Acclimation Index is between 0-60, climbers have low acclimation of current altitude. If remain in this zone for too long and have symptoms like headache, rapid heart rate, shortness of breath, chest tightness or purple discoloration on lips, it is recommended to descend. If no obvious discomfort, please focus on rest./li>
  • When Altitude Acclimation Index is between 61-80, climbers have medium acclimation of current altitude. If no obvious discomfort, climbers can perform certain activities to better adapt to current altitude. Please focus on rest if discomfort occurs./li>
  • When Altitude Acclimation Index is between 81-100, climbers have strong acclimation of current altitude. If remain in this zone with no obvious discomfort, expedition can resume./li>

In order to record accurate readings, please place the watch tightly against your wrist and next to the wrist bone. During the measurement, please keep your forearm horizontal and still.

When temperature is low, blood vessels will shrink and device may fail to detect SpO2 readings. When low temperature notification shows up during the measurement, please bring up the temperate of your wrist and resume the measurement.

Altitude Performance

From the toolbox/shortcut menu, select to take a blood oxygen SpO2 measurement.
  • Press the CONFIRM button to start a new SpO2 measurement.
  • Data available on this page
    • Top section – Altitude performance index (available if elevation is over 2500m or 8250ft)
    • Middle section – SpO2 and time since last reading
    • Lower section – elevation
    • Scroll down to view the SpO2 (in red, yellow and green) and elevation (in blue) graph in the last 24 hours and 3 days.

One of the main advantages on APEX, APEX Pro and VERTIX models when compared with other watches is the Digital Knob. With the Digital Knob, you can easily operate the watch using one finger to scroll or click. Even if you are in the middle of a workout or wearing thick gloves in subzero environment, Digital Knob is the ideal solution for operating your watch.

COROS has conducted rigorous tests to ensure the durability of the Digital Knob even in the toughest environments and user cases.

Click to learn how APEX and VERTIX are tested.

Data Syncing

In order to receive daily and training data collected from the COROS app to your Apple Health app, please follow the steps below. 

  • Open the Apple Health app.
  • Access your profile via the top right corner. 
  • Locate “Privacy” and then tap on “Apps”.
  • Select “COROS” and enable supported data types.
    • Cycling Distance
    • Heart Rate
    • Sleep Analysis
    • Steps
    • Swimming Distance
    • Walking + Running Distance

On COROS watches
System > More Settings > Unit > Imperial (feet) | Metric (meters)

On the COROS app
Profile page > Profile Setting > Units > ft/lbs | cm/kg

It depends and most likely the answer is no. Tattoos will absorb the signal emitted from optical wrist-based heart rate sensors on GPS watches. Depending on the color and pattern of the tattoos, COROS watches may or may not be able to generate valid heart rate readings.

On the COROS app

Locate unwanted activities on the workout history page. Swipe left to delete. There’s no recovery after deletion. 

On the COROS watch

Activities under 1 minute of workout time can be deleted manually. After finishing an activity, the following message will pop up on the screen. Press the lower button to confirm the deletion. 

“Workout Time is less then 1 minute. Save the Data?”

You can’t manually delete longer activities on your COROS watch. However, older activities will be overwritten by newer ones when the storage on the watch runs out. Please sync your COROS watch with the COROS app on a daily basis so that your data is securely stored on your COROS account. 

You may reset the watch which will be restored to the factory settings. This will delete all activities and customization settings on your COROS watch. However, this will not delete any data saved on your COROS account. 

Most 3rd party apps like Strava and TrainingPeaks don’t display the raw data provided by COROS. Instead, they usually use their own algorithms and ways to parse, filter and recalculate workout data. As a result, there could be discrepancies on data including distance, workout time, pace, GPS tracking, etc.

Indoor Run distance calibration doesn’t apply to 3rd party apps because they often use their own algorithms to recalculate the distance, pace and other data. Simply feeding the calibrated distance to 3rd party apps doesn’t work. You will need to manually adjust the distance on 3rd party apps.

Data displayed on the COROS app is the raw data gathered by your COROS watch.

Link your COROS account with 3rd party apps on the COROS app to enjoy a fast and seamless data syncing experience.

  • On the COROS app > Profile page > 3rd party Apps > Strava > Connect > Login on the pop-up browser and follow instructions to complete the integration.

NOTE: Workouts uploaded to the COROS account after the account integration will be automatically synced to connected 3rd party apps. Previous workouts require manual export from the COROS app and import to 3rd party apps.

Can’t complete 3rd party integrations with an iPhone?

If you are on the Connect page of the COROS app and the status circle never stops spinning, please follow the steps to fix this issue on your iPhone.

  • Settings > Screen Time > Content and Privacy Restrictions > Enable Content and Privacy Restrictions > Allowed Apps > Enable Safari.

Supported app list

COROS supports the following featured 3rd party apps.
Apple Health  |  Strava  |  Keep |  We Run  |  Running Quotient  |  Training Peaks

Unlike some of the brands that are using technologies provided by data vendors directly, COROS works with a partner to co-develop the COROS trainer and other fitness data. The workload between COROS and our partner is shared almost equally. Our partner has its original lab designs and algorithms while COROS provides feature designs, user case applications and real-world testing. The development and improvement is an on-going process and we are confident with the in-house development process. COROS is aiming to create a better and more accurate platform for the sports community.

Open Water

Yes, the heart rate data recorded during the Open Water mode on COROS watches will be displayed on Strava.  

Pool Swim

No, COROS is working with Strava on this and the estimated release timeline is summer 2020. 

Accessories

Stryd isn’t supported on COROS watches at this moment. We are working with Stryd and hope to complete the integration in summer 2020. 

COROS watches can be used as heart rate monitors for supported ANT+ and Bluetooth devices or training apps on smartphones. Please follow the steps below to broadcast the heart rate data collected from your COROS watch.

 

Broadcast HR via ANT+ connection

  • Main watch face > Toolbox menu > Broadcast HR.
  • Open the pairing page on supported devices/apps and wait to connect. 

 

Broadcast HR via Bluetooth connection

  • Due to the Bluetooth technology limitations, only ONE Bluetooth connection can be allowed during HR broadcast. 
  • Please remove the watch from the COROS app via the Device page. 
  • Go to the Bluetooth settings on your phone and disconnect/remove the watch from the paired device list. 
  • Main watch face > Toolbox menu > Broadcast HR.
  • Open the pairing page on supported devices/apps and wait to connect. 

COROS watches support pairing with ANT+ and Bluetooth enabled accessories from major brands. Supported accessory types are listed below. 

ANT+:

  • Heart rate chest straps
  • Bike power meters
  • Speed sensors
  • Cadence sensors
  • Bike trainers.
  • NOTE: Running foot pods aren’t supported, however COROS may include this in future development plan.

Bluetooth:

  • Heart rate chest straps
  • Speed sensors
  • Cadence sensors

You can add multiple accessories from the same type to the Added List on your COROS watch. Only one accessory per type can be paired with your COROS watch during workouts.

Accessories from different types can work together in one workout. For instance, paired chest strap and cycling power meter can both work in Indoor Bike mode at the same time.

Dual accessories such as dual-sided power meters can still pair with the watch but only one side of them can work with the watch.

Screen Visibility

This is usually caused by incomplete or interrupted firmware update on your watch. Please open the COROS app and make sure the watch is connected within the app. On the Device page, the app will ask if you would like to fix the firmware on the watch. Complete the firmware repair to solve this extra small font issue. 

Backlight

Notifications, alerts, raised wrist, and button operations will activate the backlight for 10 seconds. The brightness of the backlight should be enough for darker environments or indoor use. Unfortunately, you can’t change the brightness level of the backlight.

Backlight is one of the main battery killers. In order to extend the battery performance, please watch for the backlight use.
  • Main watch face > System > More Settings > Gesture Backlight > OFF.

Screen visibility

Due to the nature of the LCD screen used on COROS watches, the visibility is the best when used in outdoor environments under direct sunlight. The stronger the sunlight is, the better the screen visibility is. Below are solutions to enhance the visibility during workouts.

  • Turn on White Background feature on the watch.
    • Main watch face > System > Workout Interface > Background Color > White.
  • Select Large in the font size option on the watch.
    • Main watch face > System > Workout Interface > Font Size > Large.
  • Reduce the number of data metrics on the workout data page by changing the frame on the COROS app.
    • COROS app > Device page > Workout Data > select workout mode > select a data page > select the desired frame.
  • Turn on Night Mode on APEX Pro and VERTIX for low brightness level always-on backlight. Once activated, the mode will last till the next sunrise.
    • Main watch face > Toolbox/shortcut menu > Night Mode > ON.

APEX, APEX Pro and VERTIX models are equipped with more durable and scratch-resistant sapphire glass. Due to the nature of the sapphire material, the visibility is slightly affected compared with other less durable screen materials.

VERTIX may have a slightly dimer screen than the other COROS models due to the diamond-like coating on the screen that provides outstanding durability and scratch resistance.

Backlight

Notifications, alerts, raised wrist, and button operations will activate the backlight for 10 seconds. The brightness of the backlight should be enough for darker environments or indoor use. Unfortunately, you can’t change the brightness level of the backlight.

Backlight is one of the main battery killers. In order to extend the battery performance, please watch for the backlight use.

  • Main watch face > System > More Settings > Gesture Backlight > OFF.
Screen visibility

Due to the nature of the LCD screen used on COROS watches, the visibility is the best when used in outdoor environments under direct sunlight. The stronger the sunlight is, the better the screen visibility is. Below are solutions to enhance the visibility during workouts.

  • Turn on White Background feature on the watch.
    • Main watch face > System > Workout Interface > Background Color > White.
  • Select Large in the font size option on the watch.
    • Main watch face > System > Workout Interface > Font Size > Large.
  • Reduce the number of data metrics on the workout data page by changing the frame on the COROS app.
    • COROS app > Device page > Workout Data > select workout mode > select a data page > select the desired frame.
  • Turn on Night Mode on APEX Pro and VERTIX for low brightness level always-on backlight. Once activated, the mode will last till the next sunrise.
    • Main watch face > Toolbox/shortcut menu > Night Mode > ON.

APEX, APEX Pro and VERTIX models are equipped with more durable and scratch-resistant sapphire glass. Due to the nature of the sapphire material, the visibility is slightly affected compared with other less durable screen materials.

VERTIX may have a slightly dimer screen than the other COROS models due to the diamond-like coating on the screen that provides outstanding durability and scratch resistance.

Battery Performance

COROS is proud to be known as the leader in GPS watch battery performance. Our products are able to achieve an impressive battery life in a compact size due to our top-notch, power efficient technology. What’s most important, unlike some other brands in the industry, is that we can assure your battery will last as long or even longer than what we presume. Most watches in the industry using the term “up to” however many hours, typically won’t last the user that long and if anything could be less. For instance, while our APEX 42mm has 24 hours in full GPS mode, a lot of our users have exceeded this performance by having some remaining juice after a 24-hour race.

In the real world, battery performance is affected for a variety of reasons. Things like the strength of your GPS signal or setting up your watch, can impact the amount of battery the watch is using. Our advertised battery life takes consideration of normal user preference, but we feel it is important to let everyone know the battery consumption for each component of the watch. Here are some interesting stats for you.

We have broken down each part of your watch using the numbers below to give you an idea of the power consumption. (Assuming turning on GPS and running with it is 100% battery consumption). Keep in mind this is just an estimate because each watch model can be a little different from each other due to different hardware designs.

Normal GPS activity with HR100%
Standby Mode2.50%
Indoor Modes w/o GPS20%
Navigation Mode10%
POD or other sensors connection70%
Backlight135%
Night Mode15%
Oximeter Measuring150%
Vibration230%

To use this data, simply add them all together. For example, running with GPS is 100%, but running with GPS with the backlight always-on would use 235% (100%+135%= 235%), which is more than two times the power consumption. If you add a sensor such as COROS POD to your run, the power consumption will become even higher to 305%. With 3 times the power consumption, you would only get 20 hours of GPS workout time with your VERTIX (advertised as 60 hours). Thanks to the innovative Night Mode in VERTIX and APEX Pro, you will only increase 15% of your battery consumption if you want it to be always-on throughout your night race.

Another thing to note is the data above is a measurement for the same length of time. Having multiple notifications on the watch can take up quite a bit more energy but can be minimized by reducing the number of vibrating alerts you get throughout your run/workout. Meanwhile, each alert brings up backlight for a few seconds, which is another huge factor to your battery life.

Navigation takes about 10% additional battery from your watch. When you turn on navigation but only scroll to the navigation page when needed, this will most likely put your battery performance back to the normal range.

The bottom line is frequent alert with vibration and backlight, POD or another sensor connection, oximeter measuring is a big part of your unexpected battery consumption. If you are in a situation where battery performance becomes critical, try to turn them off, and you will be amazed when you find our products’ performance exceeds what we promised.

UltraMax GPS mode utilizes GPS, motion sensors and proprietary algorithms to extend the battery life during outdoor running workouts without sacrificing too much of the tracking accuracy. For every 120 seconds, the GPS is switched on for 30 seconds. COROS’ Intelligent Stride algorithm along with motion sensors will kick in for the remaining 90 seconds.

Every outdoor run using full GPS mode and calibrated indoor run improve the Intelligent Stride algorithm and enhances the tracking of your next running workout in weak or no GPS signal conditions including workouts in UltraMax mode.

To enable the UltraMax GPS mode, please start an outdoor running workout such as Run, Trail Run and Hike. Then press and hold the BACK/LAP button to open the toolbox/shortcut menu. Scroll to locate the UltraMax setting and switch it on.

It is recommended to calibrate the compass before using this feature.

Night Mode provides low brightness level always-on backlight for training at night or darker conditions. Frequently activating the standard backlight will drain the battery life on your COROS watch. Once Night Mode is switched on, the always-on backlight will be dimmed and remain lit until the end of the workout or the next sunrise.

Access Night Mode from the Toolbox/Quick menu on APEX Pro and VERTIX. 

  • Main watch face or during workouts > press and hold the BACK/LAP button > Toolbox/Quick menu > Night Mode.
  • Not available on PACE or APEX. 

Breadcrumb Navigation

Supported Watch Model:
  • APEX
  • APEX Pro
  • VERTIX

Back to Start feature is available on select outdoor workout modes like Run, Trail Run, Hike and more. 

  • Start the outdoor workout mode and ensure the GPS connection is established. 
  • Pre-loaded route isn’t required to enable this feature. 
  • When you are ready to return to the starting point of the workout, don’t end the workout. 
  • Press and hold the BACK/LAP button to access the quick menu and locate “Navi. Setting”.
  • Select “Back to Start” and follow the exact route you just made via breadcrumb navigation.

UltraMax GPS mode utilizes GPS, motion sensors and proprietary algorithms to extend the battery life during outdoor running workouts without sacrificing too much of the tracking accuracy. For every 120 seconds, the GPS is switched on for 30 seconds. COROS’ Intelligent Stride algorithm along with motion sensors will kick in for the remaining 90 seconds.

Every outdoor run using full GPS mode and calibrated indoor run improve the Intelligent Stride algorithm and enhances the tracking of your next running workout in weak or no GPS signal conditions including workouts in UltraMax mode.

To enable the UltraMax GPS mode, please start an outdoor running workout such as Run, Trail Run and Hike. Then press and hold the BACK/LAP button to open the toolbox/shortcut menu. Scroll to locate the UltraMax setting and switch it on.

It is recommended to calibrate the compass before using this feature.

Not at this moment. COROS may add more navigation features via firmware updates to supported models in future. 

Breadcrumb navigation tracking allows users to follow a pre-loaded GPX route on the COROS watch when training or racing in unfamiliar locations. Real time information on heading, elevation and alerts are available to help users stay on track and get back on course if a turn is missed.

Navigation features are available on the following models and workout modes.

COROS models:

  • APEX
  • APEX Pro
  • VERTIX
  • PACE doesn’t support this feature due to hardware limitation.

Workout modes:

  • Run
  • Trail Run
  • Mountain Climb
  • Hike
  • Bike
Navigation settings on COROS watches

On the supported workout modes, select Settings and then select Nav. Settings.

Navi. Settings
Select to change navigation related settings.

  • Select one route to navigate among the stored routes on the watch.
  • Start Course
    • Select to begin the workout in navigation mode.
  • Elevation Details
    • Select to preview the elevation details for this route including total ascent/descent, max elevation and distance.
  • Start Point Direction
    • Select to choose the start point for this route.
  • Map Direction
    • Select to choose the heading of the navigation mode between true north up or heading up.
  • Deviate Course Alert
    • Select to enable or disable the off-route alert. Once enabled, the watch will alert you every minute if you remain deviated from the route.
Use the navigation features on COROS watches

Once Start Course is selected, you will enter the navigation page. The starting location and your current location are marked separately on the page. Head to the starting location and follow the route. If you are deviated from the route for 20 meters / 65 feet and over 10 seconds, the off-route alert will kick in. If you can’t get back on course soon, the off-route alert will be triggered every minute.

Viewing mode

On the navigation tracking page, press the knob once to enter the viewing mode. A small +/- sign will show up on the right-hand side of the page. You can then zoom in/out by scrolling the knob. Press the BACK/LAP button to reset the scale to 100 feet or 25 meters.

APEX Pro and VERTIX users can touch and drag the route on the screen to easily preview the rest of the route.

To exit the viewing mode, press the knob once. The +/- sign will also disappear.

You can scroll the knob to change the data pages only when you are not in the viewing mode. Press the knob on any other data pages except the navigation and elevation profile pages to pause the workout.

Workouts

Training Load

Applicable to all workout modes

Training load evaluates if the past training is reasonable to the user and helps avoid excessive training and fatigue. Use the training load data as a reference when adjusting the intensity and duration of your training. It is always recommended to listen to your body if the training load says otherwise. 

LevelLoad Description
0-40Under-training
41-60Low
61-100Optimized
101-120Excessive

 

Fitness Index

Applicable to outdoor running modes only (Run, Trail Run, Track Run, Hike)

  • VO2 Max
    • VO2 Max is the maximum amount of oxygen your body can utilize during training. A higher VO2 Max reading generally means a better fitness level. COROS watch uses heart rate and other data to provide a fairly accurate estimate of VO2Max compared with lab results. 
  • Lactate Threshold
    • Lactate threshold is the breaking point when aerobic training starts to transform to anaerobic. It can also be defined as the intensity of exercise at which lactate begins to accumulate in the blood at a faster rate than it can be removed. It is a common indicator used in competitive sports to evaluate training loads and fatigue level. 
  • Threshold Pace
    • Lactate threshold pace is the fastest pace at which the body doesn’t accumulate lactic acid significantly in the blood during the workout. Running at this pace is a great way to build up aerobic fitness and train for longer distance. 

If some or all of the fitness index isn’t displaying on the COROS app, please ensure the following prerequisites are met. Easy runs don’t provide enough data to generate these metrics.

  • Complete at least 3 outdoor running workouts. 
  • Heart rate is in zone 3 or above for over 30 minutes for each workout. 

If you have doubts about the accuracy of the fitness index, please check first if you have set up the resting heart rate and maximum heart rate correctly on the COROS app. 

 

Fitness Level

Applicable to outdoor running modes only (Run, Trail Run, Track Run, Hike)

Fitness Level is a fitness and endurance evaluation metric. It is the result of a combination of VO2 Max, lactate threshold and workout efficiency. It also indicates your performance level. 

The relationship between the heart rate performance and pace greatly impacts the fitness level. If you run faster with a similar heart rate performance, the fitness level will increase. If your overall heart rate is higher at a similar pace, the fitness level will decrease. Training with heart rate chest straps or armbands are highly recommended for the best results. 

In order to generate VO2max, lactate threshold and threshold pace data and display on the COROS app, your watch needs to record enough data via outdoor running workouts.

Please make sure your outdoor runs are intense enough with at least 30 minutes of heart rate in Zone 3 (out of 5 zones) or above. Easy runs won’t increase your heart rate to the required level. 

Workouts other than outdoor running won’t generate or affect the VO2max, lactate threshold or threshold pace estimates. 

A weight lifting program is under development and may be added via future firmware updates to supported COROS watches. 

In the meantime, you can utilize the Gym Cardio mode to track the heart rate, calories and time of your weight lifting workouts. 

Please change the following setting on your watch. 

  • Any workout mode > Settings > Activity Alert > Distance Alert > set the correct distance for auto lap (some workout modes may have 0.62 mile in default). 

To enable notifications during workouts, please follow the steps below.

  • Main watch face > System > Workout Interface > Msg. & Call Alerts > ON.

You can’t expand or manage the notifications during workouts.

NOTE: Receiving notifications may increase the battery consumption on your COROS watch.

PACE watch doesn’t support this feature.


Daily Use

All COROS watches support 24/7 sleep tracking with the latest firmware update. Below steps show how our algorithms work. 

  1. Set up the sleep start time on the COROS app as close to when you actually fall asleep as possible.
    1. COROS app > Profile page > Profile Setting > Sleep Tracking > Start Time. 
  2. Wear the watch properly on your wrist so that the HR sensor can detect your heart rate to monitor your sleep status. The sleep tracking will be affected if the watch is loosely worn or your arm has frequent movements.
  3. Your COROS watch will continue tracking your sleep even if you take bathroom breaks within the first 7 hours from the sleep start time setting.
  4. Your watch will stop tracking the sleep after the 7-hour mark once you are awake. It won’t resume tracking your sleep even if you fall back to sleep later.
Access timer, stopwatch and alarm features from the toolbox/shortcut menu.
  • Main watch face or during workouts > press and hold the BACK/LAP button > toolbox/shortcut menu.
Timer
Select to set up to 3 timers with repeatable feature available.
  • Setup new times will overwrite previous ones.
  • Press the CONFIRM button to start and pause the timer.
  • Press the BACK/LAP button to restart the timer or return to the timer setup page.
  • In order to repeat a timer, select Repeat > ON.
  • Hold the BACK/LAP button to exit the page without interrupting the timer.
  • Available in daily and workout modes.
Stopwatch
Select to use the stopwatch function.
  • Press the CONFIRM button to start and pause the stopwatch.
  • Press the BACK/LAP button to start a new lap and reset the stopwatch.
  • Hold the BACK/LAP button to exit the page without interrupting the stopwatch.
  • Available in daily and workout modes.
Alarm
Select to set up to 10 new alarms or manage existing alarms.
  • Available alarm mode in Only Once | Every Day | Custom by day of week.
  • Snooze time is not customizable.

Troubleshoot

You don’t need to pause and finish a workout and return to the main watch face to check time of day. Please follow the steps below to set up time of day on workout data pages.

  • On the Device page of the COROS app, tap on “Workout Data”.
  • Select the workout mode to modify.
  • Choose one of the workout data pages and tap on the watch face.
  • Locate time of day on the bottom bar and replace the current data.
  • Save the changes to see time of day on your next workout.

If you are on the Connect page of the COROS app and the status circle never stops spinning, please follow the steps to fix this issue on your iPhone.

  • Settings > Screen Time > Content and Privacy Restrictions > Enable Content and Privacy Restrictions > Allowed Apps > Enable Safari.

If there’s no new firmware available for your watch to update, please check the COROS app version. The latest COROS app version is required for the firmware update. Go to the iOS App Store or Google Play Store to update the COROS app.

The current firmware release notes can be found at this link. Please check if you have the latest firmware on the watch.

If you can’t pair the watch with your phone, check if the Bluetooth connection is lost and a Bluetooth disconnection icon will show up on the main watch face. “Please Connect to App” will appear on the Notifications widget. On the COROS app, you can’t manually sync the data by pulling down Today’s page.

Please follow the steps to fix the Bluetooth connection.

  • On the Device page from the COROS app, tap on the watch image and locate the “Remove” option down below. Tap on it to remove the device from the COROS app.
  • On your smartphone’s Bluetooth connection page, forget/delete the watch.
  • Restart both the phone and the watch.
  • Pair the watch to your phone via the COROS app.

Alternatively, you can try performing a hard restart on your watch. Press and hold the CONFIRM button for at least 15 seconds, or until you see the COROS logo. This will not reset your watch or delete any data.

 

Invalid QR code issue:

The QR code page on a functioning watch will list the 6 digit device ID in the format of “ID: 123ABC” once the watch is disconnected from the phone. 

Access the QR code page on your watch via System > Pair Phone. 

If the device ID is missing or replaced with “vx”, you will not be able to pair the watch with your phone anymore. Scanning the invalid QR code will receive an error message “This device is not supported”. Please reset the watch a few times and check if the issue remains. If so, please contact support@coros.com and list the following info to begin the replacement process. 

  • A copy of the product order receipt
  • Current shipping info
  • Product model/color/size info
  • A photo of the invalid QR cod
  • COROS account email
  • 6 digit watch ID

 

iPhone issues:
Please go to the system settings on your phone and check whether you have disabled Bluetooth access for the COROS app.
  • Settings > Privacy > Bluetooth > COROS > ON.
  • Settings > Bluetooth > COROS watch > “i” icon > Share System Notifications > ON.
  • Settings > Notifications > Show Previews > Always.
  • Settings > Notifications > Scroll down and select “Message” > Scroll down and select Show Previews > Always.

 

Android issues:

For Android users experiencing connection issues every time the Bluetooth is restarted, please try changing the Bluetooth AVRCP protocol version in Developers settings and restart the phone.

Apk link for direct download of the COROS Android app via https://d31oxp44ddzkyk.cloudfront.net/apk/426242068348780544.apk

 

Android 10 issues:

Unfortunately, there has been a known occurrence with Android 10 users on Bluetooth connection issues, including failure to reconnect after disconnection. COROS has made no changes to the COROS app and products in terms of Bluetooth connectivity. After testing and investigation, we have concluded that the Bluetooth connection issue was caused by the Android 10 Bluetooth compatibility affecting all device types with BLE connection.

It is unfortunate that as the manufacturer of Bluetooth devices, COROS has limited solutions to fix this unless Android releases new updates to Android 10 users to improve the Bluetooth compatibility. Android is known to release major updates without fully testing the compatibility with all devices. Good news is that Android may release a new update soon.

Although this isn’t an issue with the watch itself, here are some solutions to help in the meantime.

Please make sure to update the Android 10 system version once new updates are available. COROS engineering team is also in contact with Android team for this matter.

You can also try the following steps to see if they fix the issue temporarily. It’s not guaranteed but this is the best we can do for now.

– Remove the watch on the COROS app.
– Restart the phone.
– Enter airplane mode on your phone.
– Enable GPS.
– Wait for 30 seconds and exit airplane mode. 
– Pair the watch on the COROS app via “pair manually” instead of scanning the code.

NOTE: Bluetooth headsets use Bluetooth 2.0 (Classic Bluetooth) and smart wearables generally use Bluetooth 4.0/5.0 (BLE). These two protocols and systems are different.

If the watch doesn’t power on and the screen is black even with charging, please follow the steps below to restart the watch.

  • Charge the watch for over 2 hours even if the screen doesn’t turn on.
  • Remove the charging cable from the watch (this step is very important).
  • Press and hold the Power button for over 15 seconds or until the COROS logo shows up.
    • Power button location
      • PACE – lower left button (CONFIRM button)
      • APEX – top button (Digital Knob)
      • APEX Pro – top button (LIGHT button)
      • VERTIX – middle button (Digital Knob)
  • Please don’t press both buttons on your COROS watch at the same time. Otherwise the COROS watch will enter Inactive mode and will not respond to normal operation or charging.
  • Please power off the watch if you plan to stop using it – main watch face > System > More Settings > Turn Off.

If the watch can’t maintain a stable recharge, please check if the power outlet voltage is too high/low. Switch over to a computer or a standard USB power adapter and try again.

Please check if the metal pins are clear of debris. Disconnect the cable from power and rinse both the watch and the cable. Let them air dry and try again.

When you try to open a menu, start or pause a workout and the CONFIRM button doesn’t seem to work, your watch may be in Auto Lock mode. If a tiny lock sign shows up on the watch face when you operate the buttons, you need to unlock the watch display first. This prevents any button mis-operation that may affect your daily and workout usage. Depending on the Auto Lock mode, you can unlock the display by the following steps.

Here’s how to adjust the Auto Lock mode setting:

– Main watch face > System > More Settings > Auto Lock > Standby Mode | Workout Mode > Scroll to Unlock | Hold to Unlock | OFF

  • Auto Lock – Hold to Unlock
    • – Press and hold the Digital Knob or the BACK/LAP button to unlock the display
  • Auto Lock – Scroll to Unlock
    • – Scroll the Digital Knob in any direction until the meter bar reaches top.

Once Auto Lock mode is activated, the display will automatically lock if:

  • – Display is idle for 2 minutes in Standby mode
  • – Display is idle for 10 seconds in Workout mode

 

It is possible that dirt can get stuck inside the button component. Please clean the button with running water. Slowly press/scroll the button several times during the rinse will also help. 

 

Power button on COROS watches
  • PACE – lower left button (CONFIRM button)
  • APEX – top button (Digital Knob)
  • APEX Pro – top button (LIGHT button)
  • VERTIX – middle button (Digital Knob)

If you can’t turn on the COROS watch, please follow the steps below to troubleshoot.

  • Charge the watch for over 2 hours even if the screen doesn’t turn on. 
  • Remove the charging cable from the watch (this step is very important).
  • Press and hold the Power button for over 15 seconds or until the COROS logo shows up to restart the watch.

Please don’t press both buttons on your COROS watch at the same time. Otherwise your watch will enter Inactive mode and will not respond to normal operation or charging.

Please power off the watch if you plan to stop using it – main watch face > System > More Settings > Turn Off.

Workouts

Training Load

Applicable to all workout modes

Training load evaluates if the past training is reasonable to the user and helps avoid excessive training and fatigue. Use the training load data as a reference when adjusting the intensity and duration of your training. It is always recommended to listen to your body if the training load says otherwise. 

LevelLoad Description
0-40Under-training
41-60Low
61-100Optimized
101-120Excessive

 

Fitness Index

Applicable to outdoor running modes only (Run, Trail Run, Track Run, Hike)

  • VO2 Max
    • VO2 Max is the maximum amount of oxygen your body can utilize during training. A higher VO2 Max reading generally means a better fitness level. COROS watch uses heart rate and other data to provide a fairly accurate estimate of VO2Max compared with lab results. 
  • Lactate Threshold
    • Lactate threshold is the breaking point when aerobic training starts to transform to anaerobic. It can also be defined as the intensity of exercise at which lactate begins to accumulate in the blood at a faster rate than it can be removed. It is a common indicator used in competitive sports to evaluate training loads and fatigue level. 
  • Threshold Pace
    • Lactate threshold pace is the fastest pace at which the body doesn’t accumulate lactic acid significantly in the blood during the workout. Running at this pace is a great way to build up aerobic fitness and train for longer distance. 

If some or all of the fitness index isn’t displaying on the COROS app, please ensure the following prerequisites are met. Easy runs don’t provide enough data to generate these metrics.

  • Complete at least 3 outdoor running workouts. 
  • Heart rate is in zone 3 or above for over 30 minutes for each workout. 

If you have doubts about the accuracy of the fitness index, please check first if you have set up the resting heart rate and maximum heart rate correctly on the COROS app. 

 

Fitness Level

Applicable to outdoor running modes only (Run, Trail Run, Track Run, Hike)

Fitness Level is a fitness and endurance evaluation metric. It is the result of a combination of VO2 Max, lactate threshold and workout efficiency. It also indicates your performance level. 

The relationship between the heart rate performance and pace greatly impacts the fitness level. If you run faster with a similar heart rate performance, the fitness level will increase. If your overall heart rate is higher at a similar pace, the fitness level will decrease. Training with heart rate chest straps or armbands are highly recommended for the best results. 

In order to generate VO2max, lactate threshold and threshold pace data and display on the COROS app, your watch needs to record enough data via outdoor running workouts.

Please make sure your outdoor runs are intense enough with at least 30 minutes of heart rate in Zone 3 (out of 5 zones) or above. Easy runs won’t increase your heart rate to the required level. 

Workouts other than outdoor running won’t generate or affect the VO2max, lactate threshold or threshold pace estimates. 

A weight lifting program is under development and may be added via future firmware updates to supported COROS watches. 

In the meantime, you can utilize the Gym Cardio mode to track the heart rate, calories and time of your weight lifting workouts. 

Please change the following setting on your watch. 

  • Any workout mode > Settings > Activity Alert > Distance Alert > set the correct distance for auto lap (some workout modes may have 0.62 mile in default). 

To enable notifications during workouts, please follow the steps below.

  • Main watch face > System > Workout Interface > Msg. & Call Alerts > ON.

You can’t expand or manage the notifications during workouts.

NOTE: Receiving notifications may increase the battery consumption on your COROS watch.

PACE watch doesn’t support this feature.


Troubleshoot

You don’t need to pause and finish a workout and return to the main watch face to check time of day. Please follow the steps below to set up time of day on workout data pages.

  • On the Device page of the COROS app, tap on “Workout Data”.
  • Select the workout mode to modify.
  • Choose one of the workout data pages and tap on the watch face.
  • Locate time of day on the bottom bar and replace the current data.
  • Save the changes to see time of day on your next workout.

If you are on the Connect page of the COROS app and the status circle never stops spinning, please follow the steps to fix this issue on your iPhone.

  • Settings > Screen Time > Content and Privacy Restrictions > Enable Content and Privacy Restrictions > Allowed Apps > Enable Safari.

If there’s no new firmware available for your watch to update, please check the COROS app version. The latest COROS app version is required for the firmware update. Go to the iOS App Store or Google Play Store to update the COROS app.

The current firmware release notes can be found at this link. Please check if you have the latest firmware on the watch.

If you can’t pair the watch with your phone, check if the Bluetooth connection is lost and a Bluetooth disconnection icon will show up on the main watch face. “Please Connect to App” will appear on the Notifications widget. On the COROS app, you can’t manually sync the data by pulling down Today’s page.

Please follow the steps to fix the Bluetooth connection.

  • On the Device page from the COROS app, tap on the watch image and locate the “Remove” option down below. Tap on it to remove the device from the COROS app.
  • On your smartphone’s Bluetooth connection page, forget/delete the watch.
  • Restart both the phone and the watch.
  • Pair the watch to your phone via the COROS app.

Alternatively, you can try performing a hard restart on your watch. Press and hold the CONFIRM button for at least 15 seconds, or until you see the COROS logo. This will not reset your watch or delete any data.

 

Invalid QR code issue:

The QR code page on a functioning watch will list the 6 digit device ID in the format of “ID: 123ABC” once the watch is disconnected from the phone. 

Access the QR code page on your watch via System > Pair Phone. 

If the device ID is missing or replaced with “vx”, you will not be able to pair the watch with your phone anymore. Scanning the invalid QR code will receive an error message “This device is not supported”. Please reset the watch a few times and check if the issue remains. If so, please contact support@coros.com and list the following info to begin the replacement process. 

  • A copy of the product order receipt
  • Current shipping info
  • Product model/color/size info
  • A photo of the invalid QR cod
  • COROS account email
  • 6 digit watch ID

 

iPhone issues:
Please go to the system settings on your phone and check whether you have disabled Bluetooth access for the COROS app.
  • Settings > Privacy > Bluetooth > COROS > ON.
  • Settings > Bluetooth > COROS watch > “i” icon > Share System Notifications > ON.
  • Settings > Notifications > Show Previews > Always.
  • Settings > Notifications > Scroll down and select “Message” > Scroll down and select Show Previews > Always.

 

Android issues:

For Android users experiencing connection issues every time the Bluetooth is restarted, please try changing the Bluetooth AVRCP protocol version in Developers settings and restart the phone.

Apk link for direct download of the COROS Android app via https://d31oxp44ddzkyk.cloudfront.net/apk/426242068348780544.apk

 

Android 10 issues:

Unfortunately, there has been a known occurrence with Android 10 users on Bluetooth connection issues, including failure to reconnect after disconnection. COROS has made no changes to the COROS app and products in terms of Bluetooth connectivity. After testing and investigation, we have concluded that the Bluetooth connection issue was caused by the Android 10 Bluetooth compatibility affecting all device types with BLE connection.

It is unfortunate that as the manufacturer of Bluetooth devices, COROS has limited solutions to fix this unless Android releases new updates to Android 10 users to improve the Bluetooth compatibility. Android is known to release major updates without fully testing the compatibility with all devices. Good news is that Android may release a new update soon.

Although this isn’t an issue with the watch itself, here are some solutions to help in the meantime.

Please make sure to update the Android 10 system version once new updates are available. COROS engineering team is also in contact with Android team for this matter.

You can also try the following steps to see if they fix the issue temporarily. It’s not guaranteed but this is the best we can do for now.

– Remove the watch on the COROS app.
– Restart the phone.
– Enter airplane mode on your phone.
– Enable GPS.
– Wait for 30 seconds and exit airplane mode. 
– Pair the watch on the COROS app via “pair manually” instead of scanning the code.

NOTE: Bluetooth headsets use Bluetooth 2.0 (Classic Bluetooth) and smart wearables generally use Bluetooth 4.0/5.0 (BLE). These two protocols and systems are different.

If the watch doesn’t power on and the screen is black even with charging, please follow the steps below to restart the watch.

  • Charge the watch for over 2 hours even if the screen doesn’t turn on.
  • Remove the charging cable from the watch (this step is very important).
  • Press and hold the Power button for over 15 seconds or until the COROS logo shows up.
    • Power button location
      • PACE – lower left button (CONFIRM button)
      • APEX – top button (Digital Knob)
      • APEX Pro – top button (LIGHT button)
      • VERTIX – middle button (Digital Knob)
  • Please don’t press both buttons on your COROS watch at the same time. Otherwise the COROS watch will enter Inactive mode and will not respond to normal operation or charging.
  • Please power off the watch if you plan to stop using it – main watch face > System > More Settings > Turn Off.

If the watch can’t maintain a stable recharge, please check if the power outlet voltage is too high/low. Switch over to a computer or a standard USB power adapter and try again.

Please check if the metal pins are clear of debris. Disconnect the cable from power and rinse both the watch and the cable. Let them air dry and try again.

When you try to open a menu, start or pause a workout and the CONFIRM button doesn’t seem to work, your watch may be in Auto Lock mode. If a tiny lock sign shows up on the watch face when you operate the buttons, you need to unlock the watch display first. This prevents any button mis-operation that may affect your daily and workout usage. Depending on the Auto Lock mode, you can unlock the display by the following steps.

Here’s how to adjust the Auto Lock mode setting:

– Main watch face > System > More Settings > Auto Lock > Standby Mode | Workout Mode > Scroll to Unlock | Hold to Unlock | OFF

  • Auto Lock – Hold to Unlock
    • – Press and hold the Digital Knob or the BACK/LAP button to unlock the display
  • Auto Lock – Scroll to Unlock
    • – Scroll the Digital Knob in any direction until the meter bar reaches top.

Once Auto Lock mode is activated, the display will automatically lock if:

  • – Display is idle for 2 minutes in Standby mode
  • – Display is idle for 10 seconds in Workout mode

 

It is possible that dirt can get stuck inside the button component. Please clean the button with running water. Slowly press/scroll the button several times during the rinse will also help. 

 

Power button on COROS watches
  • PACE – lower left button (CONFIRM button)
  • APEX – top button (Digital Knob)
  • APEX Pro – top button (LIGHT button)
  • VERTIX – middle button (Digital Knob)

If you can’t turn on the COROS watch, please follow the steps below to troubleshoot.

  • Charge the watch for over 2 hours even if the screen doesn’t turn on. 
  • Remove the charging cable from the watch (this step is very important).
  • Press and hold the Power button for over 15 seconds or until the COROS logo shows up to restart the watch.

Please don’t press both buttons on your COROS watch at the same time. Otherwise your watch will enter Inactive mode and will not respond to normal operation or charging.

Please power off the watch if you plan to stop using it – main watch face > System > More Settings > Turn Off.

GPS, HR & Other Sensors

It depends and most likely the answer is no. Tattoos will absorb the signal emitted from optical wrist-based heart rate sensors on GPS watches. Depending on the color and pattern of the tattoos, COROS watches may or may not be able to generate valid heart rate readings.

In the past a few days, some users have reported problems with slow or failed GPS connection. The COROS team has found the root cause of the problem.
 
Cause of the problem:
Your COROS watch relies on up-to-date satellite data for faster and reliable GPS connection. The GPS satellite data downloaded on the leap day, Feb 29th 2020, was mistakenly labeled as Feb 29th 2021. As a result, when the GPS satellite data expired after 7 days on March 7th, the subsequent GPS satellite data was considered outdated and was not able to help with GPS connection.
 
Our engineers have been working hard and released a firmware update on March 10th to fix the problem. Please apply the new firmware update and tap on “GPS Satellite Data” on the Device page to update the GPS data to your watch. 
 
Our sincere apologies for the inconvenience caused for users around the world and appreciate everyone in helping us find the problem and continuing to trust our products.
 

Intelligent Stride Algorithm

Some users noticed that the pace and distance data of their usual runs remain accurate even though the GPS connection was weak or missing. The reason why COROS watches are able to provide a fairly accurate pace and distance tracking without GPS connection is because of our unique machine-learning intelligent stride algorithm. 

Every outdoor run with GPS connection and indoor run with post-workout calibration help build your very own stride model that will be used for indoor running or areas of weak GPS signal (such as tunnels). 

All COROS watches are equipped with a wrist-based optical heart rate ( OHR ) sensor providing a convenient way to monitor Heart Rate without additional accessories. Therefore, athletes can determine their training zones, overall training load and necessary recovery.

Optical heart rate sensors are generally considered as an estimate of your effort. Athletes following HR based training programs are recommended to use heart rate straps and armbands ( which can be paired to COROS watches via ANT+connection ). Here is why:

In the technology world, all sensors including OHR will receive two things: signal and noise. Signal includes everything that’s helpful to your sensor reading, while noise is what keeps disturbing your sensor from providing correct measurements. If the sensitivity of a sensor is enhanced, it often increases both the signal and noise, causing an imperfect result. Most HR chest straps are equipped with technologies to receive less noise and stronger signal resulting in superior heart rate tracking performance than OHR during interval training.

Optical HR sensors rely on the reflection of the remaining green light after certain light got absorbed by the blood under your skin to determine the pulse frequency. COROS watches have four OHR algorithms built in: running, cycling, swimming and interval running. They are customized to different types of workouts to give you the best accuracy possible. Since heart rate sensors worn on your wrist are more prone to noise interference, the wearer should take the following steps to increase the signal and reduce noise as much as possible.

Here is what you can do to increase the signal:

  • Keep your hands warm.
    The OHR signal comes from your blood reflection. So, the more blood flow you have, the better signal your watch will receive. The weather doesn’t need to be freezing to impact your OHR accuracy. As long as your hands feel cold, your blood flow is reduced significantly. The best way to solve this is to wear gloves. Another suggestion is always warm up your body ( and your hands ) before starting your workout in the winter.
  • Clean skin without heavy hair or tattoos.
    It’s not a surprise that heavy hair and/or tattoos block the light refection and cause issues. If you have a tattoo ( s ) on one of your wrists, it is recommended that you switch your watch to the other one.
  • Wear the watch higher than your wrist bone.
    This is useful especially for those who have skinny wrists, as you need to find the areas of skin with more blood flow in order to properly use the OHR.
  • Wait for your watch to display a stable HR reading.
    Just like your body, your OHR sensor requires some warm-up too. It’s recommended to stay on the “Start” page and wait a little longer so the watch can filter some noise by itself. Our watches also provide an alert beep to let you know when it’s ready to go ( if sounds are turned off, you will see a heart symbol which will be solid and steady when ready ).
  • Select the proper training mode.
    The regular running, cycling and swimming algorithms are not specifically built for tracking rapid changes in heart rate. When you train with intervals, please select the Interval Training mode under Run mode for enhanced heart rate tracking sensitivity.

Here is what you can do to reduce noise:

  • Wear it tight.
    The shake from running cadence is one of the key factors that cause a discrepancy. You want to wear your watch as tight as possible yet is still comfortable enough to limit the watch’s ability to move on your wrist. Athletes often find their watch OHR reading higher during aggressive downhill running because this is when you have the strongest steps.
  • Pick a lighter watch
    The heavier the watch is, the stronger the noise that will be created from your running stride. Generally, a lighter watch will maintain a stronger signal for a longer time.
  • Reset your OHR sensor in the middle of your run.
    Sweat/water will increase the chance of your watch moving on your wrist. So, it’s not a surprise if your OHR is working fine during the early stages of your run and becomes inaccurate later on. It could be that your hands got colder reducing blood flow, or your wrist had some sweat causing movement of the watch. Take your watch off, wipe your sweat and keep your wrist dry. Touch the OHR sensor to your running apparel instead of your skin so the reading goes away. Put it back on and resume your run. Most likely you will get a good reading again.
The bottom line is, if you are a data geek or going through heart rate training programs, it is definitely recommended to use chest straps or arm sensors for training. COROS watches are compatible with many 3rd party HR sensors with ANT+connection. Here are some external sensors that are commonly used by COROS wearers. Keep in mind using external sensors will increase the watch battery consumption as explained here.
  • Polar OH1
  • Polar H10
  • Garmin HRM Dual/Tri
  • Wahoo TICKR

COROS watches are equipped with standalone GPS modules to acquire the GPS signal individually. You don’t need to carry your phone during training for the watch to connect to GPS. Connecting to GPS on your COROS watch for the first time or traveled over 200 miles since your last GPS connection may take up to several minutes. The subsequent GPS connection should take less than 30 seconds on average. 

Please follow the steps listed below to ensure a fast GPS connection on your COROS watch. 

  • Update the GPS Satellite Data on the COROS app on a regular basis. 
    • COROS app > Device Page > tap on GPS Satellite Data. 
    • GPS Satellite Data is valid between 3 to 7 days on your COROS watch depending on the watch model. Expired data may cause GPS connection issues. 
  • Stand still in an open field away from buildings. 
  • Don’t start moving (running, cycling, swimming, etc) before GPS is fully acquired. 

If you have trouble updating the GPS Satellite Data on the COROS app and receive an error message “AGPS verification failed”, please follow the step listed below. 

  • Disable any connected VPN.
  • Switch the network on your phone (celluar/WiFi).
  • Please change the settings on your iPhone.
    • Settings > Safari > Clear History and Website Data.

OROS watches rely on the barometer for elevation readings. It converts the air pressure readings to elevation. Longer outdoor workouts are prone to be affected by changes of air pressure even if the elevation remains the same. 

Factors listed below may affect the elevation readings on the elevation widget.

  • Natural changes in the air pressure throughout the day
  • Weather changes
  • Pressurized environments
  • Heaters and air conditioners
  • Submerged in water

It is recommended to calibrate the elevation during daily tracking via GPS or manually input on a regular basis. COROS watches automatically calibrate the elevation using GPS during outdoor workouts to ensure the best accuracy. 

Please follow the step below to calibrate the elevation on your watch. 

  • Main watch face > Elevation widget > Press and hold the CONFIRM button > Use GPS | Enter Elevation. 
    • Make sure to stand in an open filed when calibrating the elevation using GPS for the best accuracy. 

Satellite conditions, weather, tall buildings, heavy tree coverage and other sources may interfere with the GPS signal and affect the GPS accuracy. Feel free to utilize the Satellite Signal feature and change the GPS mode to compare results. When GPS signal is weak or lost, COROS’ Intelligent Stride algorithm along with motion sensors will kick in to maintain a decent tracking accuracy. Every outdoor run and calibrated indoor run improves the algorithm to better track your next workout.

COROS watches use motion sensors to detect your arm’s movement and estimate your walking activities. Anything that affects your arm’s movement can impact the accuracy of the step counter, such as carrying groceries/phones/hiking poles, driving, etc.

GPS isn’t involved during daily activities tracking. As a result, COROS can’t provide a realistic estimation of your walking mileage.

The thermometer on your COROS watch is mainly used to measure the water temperature for swimming activities.

To receive an accurate reading of the air temperature, please take off your watch and let it sit still for 30 minutes.

The temperature will be affected by body heat if worn on your wrist or under the sleeve.

(Available on APEX Pro, VERTIX)

Altitude Mode

SpO2, peripheral capillary oxygen saturation, is an estimate of the amount of oxygen in the blood and measures the amount of oxygen-carrying hemoglobin in the blood. COROS watches calculate SpO2 mainly by emitting and absolving light passing through blood vessels. As the elevation increases, SpO2 will gradually decrease.

When the elevation is above 2500 meters, oxygen intake and blood oxygen saturation will decrease and may cause symptoms including acute altitude sickness and high-altitude pulmonary edema (HAPE). COROS measures SpO2, heart rate, elevation and other data to estimate altitude acclimation at certain altitude.

COROS development team successfully applied wrist based SpO2 detection technology on watches and achieved accuracy comparable to medical fingertip measurement when remain stable at the end of 2017. However, SpO2 data provides limited assistance to climbers without applicable indications and suggestions including altitude sickness risk analysis, altitude acclimation evaluation, and activity intensity suggestions.

COROS partnered with a sport university and utilized their labs to simulate high altitude environments. After extensive data collection, research, and development for over a year, COROS was able to develop an Altitude Acclimation Evaluation System. Through applying this system, individual altitude acclimation analysis coupled with real time measurements can provide sound and practical acclimation assistance and guides for climbers. COROS Altitude Acclimation Evaluation System collects the SpO2 data and evaluates the altitude acclimation level for climbers when the elevation is above 2500 meters. Climbers are given more quantified and accurate info and under real time monitoring and notifications to effectively prevent altitude sickness.

Based on the indicated zones, Altitude Acclimation Index helps climbers plan out activities accordingly.

  • When Altitude Acclimation Index is between 0-60, climbers have low acclimation of current altitude. If remain in this zone for too long and have symptoms like headache, rapid heart rate, shortness of breath, chest tightness or purple discoloration on lips, it is recommended to descend. If no obvious discomfort, please focus on rest./li>
  • When Altitude Acclimation Index is between 61-80, climbers have medium acclimation of current altitude. If no obvious discomfort, climbers can perform certain activities to better adapt to current altitude. Please focus on rest if discomfort occurs./li>
  • When Altitude Acclimation Index is between 81-100, climbers have strong acclimation of current altitude. If remain in this zone with no obvious discomfort, expedition can resume./li>

In order to record accurate readings, please place the watch tightly against your wrist and next to the wrist bone. During the measurement, please keep your forearm horizontal and still.

When temperature is low, blood vessels will shrink and device may fail to detect SpO2 readings. When low temperature notification shows up during the measurement, please bring up the temperate of your wrist and resume the measurement.

Altitude Performance

From the toolbox/shortcut menu, select to take a blood oxygen SpO2 measurement.
  • Press the CONFIRM button to start a new SpO2 measurement.
  • Data available on this page
    • Top section – Altitude performance index (available if elevation is over 2500m or 8250ft)
    • Middle section – SpO2 and time since last reading
    • Lower section – elevation
    • Scroll down to view the SpO2 (in red, yellow and green) and elevation (in blue) graph in the last 24 hours and 3 days.

One of the main advantages on APEX, APEX Pro and VERTIX models when compared with other watches is the Digital Knob. With the Digital Knob, you can easily operate the watch using one finger to scroll or click. Even if you are in the middle of a workout or wearing thick gloves in subzero environment, Digital Knob is the ideal solution for operating your watch.

COROS has conducted rigorous tests to ensure the durability of the Digital Knob even in the toughest environments and user cases.

Click to learn how APEX and VERTIX are tested.

Data Syncing

In order to receive daily and training data collected from the COROS app to your Apple Health app, please follow the steps below. 

  • Open the Apple Health app.
  • Access your profile via the top right corner. 
  • Locate “Privacy” and then tap on “Apps”.
  • Select “COROS” and enable supported data types.
    • Cycling Distance
    • Heart Rate
    • Sleep Analysis
    • Steps
    • Swimming Distance
    • Walking + Running Distance

On COROS watches
System > More Settings > Unit > Imperial (feet) | Metric (meters)

On the COROS app
Profile page > Profile Setting > Units > ft/lbs | cm/kg

It depends and most likely the answer is no. Tattoos will absorb the signal emitted from optical wrist-based heart rate sensors on GPS watches. Depending on the color and pattern of the tattoos, COROS watches may or may not be able to generate valid heart rate readings.

On the COROS app

Locate unwanted activities on the workout history page. Swipe left to delete. There’s no recovery after deletion. 

On the COROS watch

Activities under 1 minute of workout time can be deleted manually. After finishing an activity, the following message will pop up on the screen. Press the lower button to confirm the deletion. 

“Workout Time is less then 1 minute. Save the Data?”

You can’t manually delete longer activities on your COROS watch. However, older activities will be overwritten by newer ones when the storage on the watch runs out. Please sync your COROS watch with the COROS app on a daily basis so that your data is securely stored on your COROS account. 

You may reset the watch which will be restored to the factory settings. This will delete all activities and customization settings on your COROS watch. However, this will not delete any data saved on your COROS account. 

Most 3rd party apps like Strava and TrainingPeaks don’t display the raw data provided by COROS. Instead, they usually use their own algorithms and ways to parse, filter and recalculate workout data. As a result, there could be discrepancies on data including distance, workout time, pace, GPS tracking, etc.

Indoor Run distance calibration doesn’t apply to 3rd party apps because they often use their own algorithms to recalculate the distance, pace and other data. Simply feeding the calibrated distance to 3rd party apps doesn’t work. You will need to manually adjust the distance on 3rd party apps.

Data displayed on the COROS app is the raw data gathered by your COROS watch.

Link your COROS account with 3rd party apps on the COROS app to enjoy a fast and seamless data syncing experience.

  • On the COROS app > Profile page > 3rd party Apps > Strava > Connect > Login on the pop-up browser and follow instructions to complete the integration.

NOTE: Workouts uploaded to the COROS account after the account integration will be automatically synced to connected 3rd party apps. Previous workouts require manual export from the COROS app and import to 3rd party apps.

Can’t complete 3rd party integrations with an iPhone?

If you are on the Connect page of the COROS app and the status circle never stops spinning, please follow the steps to fix this issue on your iPhone.

  • Settings > Screen Time > Content and Privacy Restrictions > Enable Content and Privacy Restrictions > Allowed Apps > Enable Safari.

Supported app list

COROS supports the following featured 3rd party apps.
Apple Health  |  Strava  |  Keep |  We Run  |  Running Quotient  |  Training Peaks

Unlike some of the brands that are using technologies provided by data vendors directly, COROS works with a partner to co-develop the COROS trainer and other fitness data. The workload between COROS and our partner is shared almost equally. Our partner has its original lab designs and algorithms while COROS provides feature designs, user case applications and real-world testing. The development and improvement is an on-going process and we are confident with the in-house development process. COROS is aiming to create a better and more accurate platform for the sports community.

Open Water

Yes, the heart rate data recorded during the Open Water mode on COROS watches will be displayed on Strava.  

Pool Swim

No, COROS is working with Strava on this and the estimated release timeline is summer 2020. 

Accessories

Stryd isn’t supported on COROS watches at this moment. We are working with Stryd and hope to complete the integration in summer 2020. 

COROS watches can be used as heart rate monitors for supported ANT+ and Bluetooth devices or training apps on smartphones. Please follow the steps below to broadcast the heart rate data collected from your COROS watch.

 

Broadcast HR via ANT+ connection

  • Main watch face > Toolbox menu > Broadcast HR.
  • Open the pairing page on supported devices/apps and wait to connect. 

 

Broadcast HR via Bluetooth connection

  • Due to the Bluetooth technology limitations, only ONE Bluetooth connection can be allowed during HR broadcast. 
  • Please remove the watch from the COROS app via the Device page. 
  • Go to the Bluetooth settings on your phone and disconnect/remove the watch from the paired device list. 
  • Main watch face > Toolbox menu > Broadcast HR.
  • Open the pairing page on supported devices/apps and wait to connect. 

COROS watches support pairing with ANT+ and Bluetooth enabled accessories from major brands. Supported accessory types are listed below. 

ANT+:

  • Heart rate chest straps
  • Bike power meters
  • Speed sensors
  • Cadence sensors
  • Bike trainers.
  • NOTE: Running foot pods aren’t supported, however COROS may include this in future development plan.

Bluetooth:

  • Heart rate chest straps
  • Speed sensors
  • Cadence sensors

You can add multiple accessories from the same type to the Added List on your COROS watch. Only one accessory per type can be paired with your COROS watch during workouts.

Accessories from different types can work together in one workout. For instance, paired chest strap and cycling power meter can both work in Indoor Bike mode at the same time.

Dual accessories such as dual-sided power meters can still pair with the watch but only one side of them can work with the watch.

Screen Visibility

This is usually caused by incomplete or interrupted firmware update on your watch. Please open the COROS app and make sure the watch is connected within the app. On the Device page, the app will ask if you would like to fix the firmware on the watch. Complete the firmware repair to solve this extra small font issue. 

Backlight

Notifications, alerts, raised wrist, and button operations will activate the backlight for 10 seconds. The brightness of the backlight should be enough for darker environments or indoor use. Unfortunately, you can’t change the brightness level of the backlight.

Backlight is one of the main battery killers. In order to extend the battery performance, please watch for the backlight use.
  • Main watch face > System > More Settings > Gesture Backlight > OFF.

Screen visibility

Due to the nature of the LCD screen used on COROS watches, the visibility is the best when used in outdoor environments under direct sunlight. The stronger the sunlight is, the better the screen visibility is. Below are solutions to enhance the visibility during workouts.

  • Turn on White Background feature on the watch.
    • Main watch face > System > Workout Interface > Background Color > White.
  • Select Large in the font size option on the watch.
    • Main watch face > System > Workout Interface > Font Size > Large.
  • Reduce the number of data metrics on the workout data page by changing the frame on the COROS app.
    • COROS app > Device page > Workout Data > select workout mode > select a data page > select the desired frame.
  • Turn on Night Mode on APEX Pro and VERTIX for low brightness level always-on backlight. Once activated, the mode will last till the next sunrise.
    • Main watch face > Toolbox/shortcut menu > Night Mode > ON.

APEX, APEX Pro and VERTIX models are equipped with more durable and scratch-resistant sapphire glass. Due to the nature of the sapphire material, the visibility is slightly affected compared with other less durable screen materials.

VERTIX may have a slightly dimer screen than the other COROS models due to the diamond-like coating on the screen that provides outstanding durability and scratch resistance.

Backlight

Notifications, alerts, raised wrist, and button operations will activate the backlight for 10 seconds. The brightness of the backlight should be enough for darker environments or indoor use. Unfortunately, you can’t change the brightness level of the backlight.

Backlight is one of the main battery killers. In order to extend the battery performance, please watch for the backlight use.

  • Main watch face > System > More Settings > Gesture Backlight > OFF.
Screen visibility

Due to the nature of the LCD screen used on COROS watches, the visibility is the best when used in outdoor environments under direct sunlight. The stronger the sunlight is, the better the screen visibility is. Below are solutions to enhance the visibility during workouts.

  • Turn on White Background feature on the watch.
    • Main watch face > System > Workout Interface > Background Color > White.
  • Select Large in the font size option on the watch.
    • Main watch face > System > Workout Interface > Font Size > Large.
  • Reduce the number of data metrics on the workout data page by changing the frame on the COROS app.
    • COROS app > Device page > Workout Data > select workout mode > select a data page > select the desired frame.
  • Turn on Night Mode on APEX Pro and VERTIX for low brightness level always-on backlight. Once activated, the mode will last till the next sunrise.
    • Main watch face > Toolbox/shortcut menu > Night Mode > ON.

APEX, APEX Pro and VERTIX models are equipped with more durable and scratch-resistant sapphire glass. Due to the nature of the sapphire material, the visibility is slightly affected compared with other less durable screen materials.

VERTIX may have a slightly dimer screen than the other COROS models due to the diamond-like coating on the screen that provides outstanding durability and scratch resistance.

Daily Use

All COROS watches support 24/7 sleep tracking with the latest firmware update. Below steps show how our algorithms work. 

  1. Set up the sleep start time on the COROS app as close to when you actually fall asleep as possible.
    1. COROS app > Profile page > Profile Setting > Sleep Tracking > Start Time. 
  2. Wear the watch properly on your wrist so that the HR sensor can detect your heart rate to monitor your sleep status. The sleep tracking will be affected if the watch is loosely worn or your arm has frequent movements.
  3. Your COROS watch will continue tracking your sleep even if you take bathroom breaks within the first 7 hours from the sleep start time setting.
  4. Your watch will stop tracking the sleep after the 7-hour mark once you are awake. It won’t resume tracking your sleep even if you fall back to sleep later.
Access timer, stopwatch and alarm features from the toolbox/shortcut menu.
  • Main watch face or during workouts > press and hold the BACK/LAP button > toolbox/shortcut menu.
Timer
Select to set up to 3 timers with repeatable feature available.
  • Setup new times will overwrite previous ones.
  • Press the CONFIRM button to start and pause the timer.
  • Press the BACK/LAP button to restart the timer or return to the timer setup page.
  • In order to repeat a timer, select Repeat > ON.
  • Hold the BACK/LAP button to exit the page without interrupting the timer.
  • Available in daily and workout modes.
Stopwatch
Select to use the stopwatch function.
  • Press the CONFIRM button to start and pause the stopwatch.
  • Press the BACK/LAP button to start a new lap and reset the stopwatch.
  • Hold the BACK/LAP button to exit the page without interrupting the stopwatch.
  • Available in daily and workout modes.
Alarm
Select to set up to 10 new alarms or manage existing alarms.
  • Available alarm mode in Only Once | Every Day | Custom by day of week.
  • Snooze time is not customizable.

Battery Performance

COROS is proud to be known as the leader in GPS watch battery performance. Our products are able to achieve an impressive battery life in a compact size due to our top-notch, power efficient technology. What’s most important, unlike some other brands in the industry, is that we can assure your battery will last as long or even longer than what we presume. Most watches in the industry using the term “up to” however many hours, typically won’t last the user that long and if anything could be less. For instance, while our APEX 42mm has 24 hours in full GPS mode, a lot of our users have exceeded this performance by having some remaining juice after a 24-hour race.

In the real world, battery performance is affected for a variety of reasons. Things like the strength of your GPS signal or setting up your watch, can impact the amount of battery the watch is using. Our advertised battery life takes consideration of normal user preference, but we feel it is important to let everyone know the battery consumption for each component of the watch. Here are some interesting stats for you.

We have broken down each part of your watch using the numbers below to give you an idea of the power consumption. (Assuming turning on GPS and running with it is 100% battery consumption). Keep in mind this is just an estimate because each watch model can be a little different from each other due to different hardware designs.

Normal GPS activity with HR100%
Standby Mode2.50%
Indoor Modes w/o GPS20%
Navigation Mode10%
POD or other sensors connection70%
Backlight135%
Night Mode15%
Oximeter Measuring150%
Vibration230%

To use this data, simply add them all together. For example, running with GPS is 100%, but running with GPS with the backlight always-on would use 235% (100%+135%= 235%), which is more than two times the power consumption. If you add a sensor such as COROS POD to your run, the power consumption will become even higher to 305%. With 3 times the power consumption, you would only get 20 hours of GPS workout time with your VERTIX (advertised as 60 hours). Thanks to the innovative Night Mode in VERTIX and APEX Pro, you will only increase 15% of your battery consumption if you want it to be always-on throughout your night race.

Another thing to note is the data above is a measurement for the same length of time. Having multiple notifications on the watch can take up quite a bit more energy but can be minimized by reducing the number of vibrating alerts you get throughout your run/workout. Meanwhile, each alert brings up backlight for a few seconds, which is another huge factor to your battery life.

Navigation takes about 10% additional battery from your watch. When you turn on navigation but only scroll to the navigation page when needed, this will most likely put your battery performance back to the normal range.

The bottom line is frequent alert with vibration and backlight, POD or another sensor connection, oximeter measuring is a big part of your unexpected battery consumption. If you are in a situation where battery performance becomes critical, try to turn them off, and you will be amazed when you find our products’ performance exceeds what we promised.

UltraMax GPS mode utilizes GPS, motion sensors and proprietary algorithms to extend the battery life during outdoor running workouts without sacrificing too much of the tracking accuracy. For every 120 seconds, the GPS is switched on for 30 seconds. COROS’ Intelligent Stride algorithm along with motion sensors will kick in for the remaining 90 seconds.

Every outdoor run using full GPS mode and calibrated indoor run improve the Intelligent Stride algorithm and enhances the tracking of your next running workout in weak or no GPS signal conditions including workouts in UltraMax mode.

To enable the UltraMax GPS mode, please start an outdoor running workout such as Run, Trail Run and Hike. Then press and hold the BACK/LAP button to open the toolbox/shortcut menu. Scroll to locate the UltraMax setting and switch it on.

It is recommended to calibrate the compass before using this feature.

Night Mode provides low brightness level always-on backlight for training at night or darker conditions. Frequently activating the standard backlight will drain the battery life on your COROS watch. Once Night Mode is switched on, the always-on backlight will be dimmed and remain lit until the end of the workout or the next sunrise.

Access Night Mode from the Toolbox/Quick menu on APEX Pro and VERTIX. 

  • Main watch face or during workouts > press and hold the BACK/LAP button > Toolbox/Quick menu > Night Mode.
  • Not available on PACE or APEX. 

Breadcrumb Navigation

Supported Watch Model:
  • APEX
  • APEX Pro
  • VERTIX

Back to Start feature is available on select outdoor workout modes like Run, Trail Run, Hike and more. 

  • Start the outdoor workout mode and ensure the GPS connection is established. 
  • Pre-loaded route isn’t required to enable this feature. 
  • When you are ready to return to the starting point of the workout, don’t end the workout. 
  • Press and hold the BACK/LAP button to access the quick menu and locate “Navi. Setting”.
  • Select “Back to Start” and follow the exact route you just made via breadcrumb navigation.

UltraMax GPS mode utilizes GPS, motion sensors and proprietary algorithms to extend the battery life during outdoor running workouts without sacrificing too much of the tracking accuracy. For every 120 seconds, the GPS is switched on for 30 seconds. COROS’ Intelligent Stride algorithm along with motion sensors will kick in for the remaining 90 seconds.

Every outdoor run using full GPS mode and calibrated indoor run improve the Intelligent Stride algorithm and enhances the tracking of your next running workout in weak or no GPS signal conditions including workouts in UltraMax mode.

To enable the UltraMax GPS mode, please start an outdoor running workout such as Run, Trail Run and Hike. Then press and hold the BACK/LAP button to open the toolbox/shortcut menu. Scroll to locate the UltraMax setting and switch it on.

It is recommended to calibrate the compass before using this feature.

Not at this moment. COROS may add more navigation features via firmware updates to supported models in future. 

Breadcrumb navigation tracking allows users to follow a pre-loaded GPX route on the COROS watch when training or racing in unfamiliar locations. Real time information on heading, elevation and alerts are available to help users stay on track and get back on course if a turn is missed.

Navigation features are available on the following models and workout modes.

COROS models:

  • APEX
  • APEX Pro
  • VERTIX
  • PACE doesn’t support this feature due to hardware limitation.

Workout modes:

  • Run
  • Trail Run
  • Mountain Climb
  • Hike
  • Bike
Navigation settings on COROS watches

On the supported workout modes, select Settings and then select Nav. Settings.

Navi. Settings
Select to change navigation related settings.

  • Select one route to navigate among the stored routes on the watch.
  • Start Course
    • Select to begin the workout in navigation mode.
  • Elevation Details
    • Select to preview the elevation details for this route including total ascent/descent, max elevation and distance.
  • Start Point Direction
    • Select to choose the start point for this route.
  • Map Direction
    • Select to choose the heading of the navigation mode between true north up or heading up.
  • Deviate Course Alert
    • Select to enable or disable the off-route alert. Once enabled, the watch will alert you every minute if you remain deviated from the route.
Use the navigation features on COROS watches

Once Start Course is selected, you will enter the navigation page. The starting location and your current location are marked separately on the page. Head to the starting location and follow the route. If you are deviated from the route for 20 meters / 65 feet and over 10 seconds, the off-route alert will kick in. If you can’t get back on course soon, the off-route alert will be triggered every minute.

Viewing mode

On the navigation tracking page, press the knob once to enter the viewing mode. A small +/- sign will show up on the right-hand side of the page. You can then zoom in/out by scrolling the knob. Press the BACK/LAP button to reset the scale to 100 feet or 25 meters.

APEX Pro and VERTIX users can touch and drag the route on the screen to easily preview the rest of the route.

To exit the viewing mode, press the knob once. The +/- sign will also disappear.

You can scroll the knob to change the data pages only when you are not in the viewing mode. Press the knob on any other data pages except the navigation and elevation profile pages to pause the workout.

Open chat
1
Need Help?
Hello!
Can we help you?
Powered by