For Garmin devices there is is a CORE connect-IQ Data Field as well as a CORE Connect-IQ Widget. These can be downloaded, installed, synchronised and updated using the Garmin Connect-IQ Smartphone App.

The CORE Connect-IQ Data Field for Garmin cycle computers and many watches allows you to view live core body temperature data in a data field and also record this data from an activity directly to your FIT file.

The CORE Connect-IQ Widget is a watch face to display live core body temperature metrics on many of the Garmin watches.

CORE Data Field Setup in overview

  • After installation, your core body temperature data will automatically be recorded to the FIT file.

    TIP: In the settings for the CORE Connect-IQ app - ensure the checkbox for backwards compatible FIT file is checked.

  • IMPORTANT - to ensure that the core body temperature data records to the FIT file, it is necessary to setup a data field that displays the live core body temperature onscreen during activities.

    (This data field does not have to be on the main screen, so can be on the second screen or another screen - however is necessary for Garmin to recognise that this data is to be recorded).

    More details on setup to view and record data here

Step by Step Guide (video)

After setup, you will now be able to automatically track your core body temperature during your activities. On Garmin, your FIT files are usually synchronised with the Garmin Connect App or can be manually accessed via USB.

If you have a Vivoactive 3 for example, this video will show you how to start and record an activity.

Please be aware, on Garmin devices the procedure for starting an activity may differ, please refer to your Garmin product manual or the Garmin Support page.

Known Garmin Issues

• If the data field on your Garmin displays a blue CIQ text and yellow dot with an exclamation mark, we have found that the best solution is to remove the CORE data field (swap it with another metric) and then put CORE data field back in.

This can occur after updating the CORE connect-IQ app and appears to be a Garmin issue and we are working to resolve this.

• After updating the CORE Connect-IQ data field in the Garmin Connect-IQ smartphone app, sometimes the screen of the Garmin app goes to the previous page and suggests that the update is unsuccessful - prompting you to update (again). This is a Garmin issue and after a few minutes, the app will then show that the app is indeed update.

• A known issue where the user selected Fahrenheit unit of temperature measurement is not correctly displayed in the ConnectIQ graph. This is due to the nature of Garmin ConnectIQ fields but we are developing a work-around.

If you are using multiple COREs

Insert the unique ANT ID of the specific CORE you want to connect with. You can find your CORE's ANT ID in the phone app by navigating to settings > about.

CORE data field:
Insert the ANT ID in the settings of the field in the connectIQ app and then sync your garmin device to your smartphone.

CORE widget:

Insert the ANT ID directly in the settings of the widget.

The widget's settings can be accessed by pressing the menu button for 1s, as shown at minute 1:40 in this video:


  • When pairing and using CORE, it should be kept fairly close to your Garmin

  • If you don't spot CORE, it helps to shake CORE, as this will temporarily increase the ANT ID frequency and make sure the first connection works better.

  • Keep your CORE firmware up-to-date! The Android and iOS Apps will automatically prompt you to update and gives you the benefit of continuing improvements.

  • If nothing else works, a magnet reset of the CORE device can help. (swipe a magnet over lower section on the SKIN side of your CORE until the LED flashes). For more detailed information on resetting your CORE follow these steps.

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