Name: ANT+ Power Meter
Rating: 4.6 (55 reviews)
Author: takura87

- Note: From recent user reports it seems this is currently not working with TrainingPeaks. 
- DCRainmaker wrote about this: https://www.dcrainmaker.com/2021/05/how-to-use-a-cycling-power-meter-with-a-vivoactive-or-venu-watch.html
- This is listed in: https://www.thisisant.com/directory/
- If you have problems or requests, please message me with your email address! While I appreciate all reviews, reviews work only one-way: negative ones often lack information to improve an real issue or may even be incorrect. 

SUMMARY:

This datafield displays (and records) power (and cadence)
A: from a power meter (PM) on a less-expensive device without "native" built-in PM support, or
B: from a second PM on a devices with native PM support, e.g. to compare two PMs.

INSTRUCTIONS:

(1) This app will initially (when ANT ID in app settings is set to zero) search for a PM that is nearby, woken up and sending power data. If that's the only PM nearby, you're ready to go. If not, I recommend setting the ANT ID in the app settings to avoid connecting with another PM. You can do so using Garmin Express app on PC/Mac or Garmin Connect app on iOS/Android. If you don't know the ID of your PM, it's displayed after searching. Or look it up somewhere on the PM or somewhere in/on the package of your PM.

(2) Searching will pause after 2 minutes to reduce impact on battery. Tap the data field or press start/stop/lap button to restart search. You can deactivate pausing in the app settings.

(3) If it doesn't find your PM, please check that
(a) your power meter is powered on and woken up,
(b) there isn't radio noise nearby (e.g. microwave oven),
(c) the PM is not paired natively in the settings of your Garmin device,
(d) your PM is not connected in another CIQ app,
(e) if searching repeats endlessly or you see "failed" between searches, you should try to restart the app: Switch to another activity and back, switch the datafield to something else and back, or switch the device off and on.

(4) On devices with a touchscreen or a dedicated start/stop-button, you can manually trigger calibration (i.e. zero-offset) by tapping the data field or quickly pushing the start-stop button two times in a row (either start-stop or stop-start). The first time, a confirmation screen ("calibrate?") will be displayed and a second tap (or start-stop or stop-start) will start the calibration, followed by either "success", "failure" or time out. If you ignore "calibrate?", it will time out and return to normal. 

LIMITATIONS:

Sadly, this is not a full replacement for a device with native PM support by its manufacturer.

(i) Data written by this app is not equal to that written by native PM support due to a limitation by Garmin's ConnectIQ (CIQ) API. Whoever reads your .fit files needs to explicitly support custom CIQ data. Only a few platforms (e.g. TrainingPeaks) treat the data equally (please set the "saveAsPower" option in the app settings; note: large memory devices only!).
Some (e.g. Garmin Connect) display the data (e.g. in activities) but don't analyze (e.g. as MMP).
Most (e.g. STRAVA) will neither display nor analyze.

(ii) For use case B, this data field is good with Garmin Connect, DCR's comparison tool, Golden Cheetah and TrainingPeak's WKO software.

(iii) This ANT+ connection seems slightly less reliable than native connections and could drop when computational demand was high - e.g. a lot of other CIQ apps running and many events (e.g. navigation, BT notifications) happening at once. Please log important data using other means.

(iv) Cadence and average power are only available on devices with memory for data fields larger than 16kB. Some power meters will require additional settings. For a third PM use the "Third PM" data field.

FOR MORE INFO:
https://takura87.wordpress.com/2020/06/14/ant-power-meter-datafield/