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Auxiliary Heart Rate


A simple data field that connects to ANT+ heart rate monitors, displays heart rate (in bpm), and records it into the FIT file.</p><p>This was developed so that I could use the built-in optical heart rate monitor on my Forerunner 235 and an external ANT+ chest strap at the same time, logging values from both for comparison.</p><p>Note that you should not have the external ANT+ heart rate monitor paired to the watch in the usual fashion, the data field will make its own connection.


Version 1.1 added the ability to set the ANT+ ID of the external heart rate monitor you wish to connect to. Set it to zero (the default) to search for any HRM (it will select the strongest signal, probably, once connected it won't switch to another HRM).



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Ytterligare information


Den här appen måste ha åtkomst till:

  • Skicka och ta emot data via ANT-radio till och från tredjepartssensorer
  • Registrera ytterligare information i aktivitetsfiler
  • D2™ Bravo D2™ Bravo
  • D2™ Bravo Titanium D2™ Bravo Titanium
  • D2™ Charlie D2™ Charlie
  • D2™ Delta D2™ Delta
  • D2™ Delta PX D2™ Delta PX
  • D2™ Delta S D2™ Delta S
  • Descent™ Mk1 Descent™ Mk1
  • Edge® 1000 Edge® 1000
  • Edge® 520 Edge® 520
  • Edge® 520 Plus Edge® 520 Plus
  • Edge® 820 Edge® 820
  • Edge® Explore 1000 Edge® Explore 1000
  • Edge® Explore 820 Edge® Explore 820
  • ForeAthlete® 230J ForeAthlete® 230J
  • ForeAthlete® 235J ForeAthlete® 235J
  • ForeAthlete® 630J ForeAthlete® 630J
  • ForeAthlete® 735XTJ ForeAthlete® 735XTJ
  • ForeAthlete® 920XTJ ForeAthlete® 920XTJ
  • Forerunner® 230 Forerunner® 230
  • Forerunner® 235 Forerunner® 235
  • Forerunner® 630 Forerunner® 630
  • Forerunner® 645 Forerunner® 645
  • Forerunner® 645 Music Forerunner® 645 Music
  • Forerunner® 735XT Forerunner® 735XT
  • Forerunner® 920XT Forerunner® 920XT
  • Forerunner® 935 Forerunner® 935
  • fēnix® 3 fēnix® 3, quatix® 3, tactix® Bravo
  • fēnix® 3 HR fēnix® 3 HR
  • fēnix® 5 fēnix® 5, quatix® 5
  • fēnix® 5 Plus fēnix® 5 Plus
  • fēnix® 5S fēnix® 5S
  • fēnix® 5S Plus fēnix® 5S Plus
  • fēnix® 5X fēnix® 5X, tactix® Charlie
  • fēnix® 5X Plus fēnix® 5X Plus
  • fēnix® Chronos fēnix® Chronos
  • vívoactive® vívoactive®
  • vívoactive® HR vívoactive® HR
Medelbetyg: (23 betyg)

den 12 april 2020 | Version 1.1.0-u-upd8

Hi, thanks a lot for this simple and great app! It works perfectly on my FR235, and I use it to compare the built-in heart rate sensor with the external strap. Would it also be useful to make it compatible with the Vivoactive 4S? Many watches are supported, but unfortunately this one is not in the list. I would like to also compare the built-in heart rate sensor of that watch with my external strap. Thanks in advance!

Kristen Wangerin
den 14 februari 2020 | Version 1.1.0-u-upd8

Cool! I look forward to playing with this data more. For others out there, I got this to work most easily (on my Mac) using fitdump: 1) Download fitdump and GarminFIT packages. 2) Extract both. 3) Put the Fit file you want to read as well as the Garmin folder (which will contain the file in the same directory as the fitdump execuable. This way fitdump will find Garmin::FIT. 4) Run: ./fitdump

Chris Dunhill
den 19 april 2019 | Version 1.1.0-u-upd8

Can't get this to work. Fenix 5+, latest firmware updates. Unpaired Polar HRM, added the ANT+ code (AND tried with 0) but data field just says "searching". Am I missing something?

Svar från utvecklaren
den 19 december 2019, IMGrant

I don't think Polar HRMs are ANT+?

Bruce Tiller
den 10 januari 2019 | Version 1.1.0-u-upd8

Great app - it allowed me to directly compare wrist based measurement on new watch (Forerunner 235) to chest strap i have worn for last couple of years. They compared very well in my case and it gives me more confidence in the watch going forward. Thanks for a very simple and useful tool!

Dragan Music
den 6 augusti 2018 | Version 1.1.0-u-upd8

Excellent app!. The athlete was concerned when switching to new FR645 as the data seemed different from FR630 + Miolink (thought it was faulty!). Was able to show the correlation and difference and turns out it was different but still OK. Big relief. Will continue to monitor over different session types to get an understanding of FR645 characteristics. Thanks for the app!

den 16 mars 2018 | Version 1.1.0-u-upd5

This is a great app for recording and comparing multiple HR monitors. The ability to input a particular ANT+ ID is a great addition.

den 16 januari 2018 | Version 1.1.0-u-upd1

Really useful to compare OHRM with band... Congrats!

den 6 december 2017 | Version 1.1.0-u-upd1

Can you help me? I really don´t know how to use it together, OHR and Chest strap. :(

den 22 oktober 2017 | Version 1.1.0-u-upd

Very helpful for comparing OHR to a HR strap!!

den 30 september 2017 | Version 1.1.0-u-upd

Found this through the forum. Thanks to all. Heart rates at rest are correct to the beat, but I suspect while running the wrist one is off (by 10 bpm). With this app and data screen I added to Running activity I will check it easily.

Neil catley
den 12 september 2017 | Version 1.1.0-u-upd

Very very useful to compare the 935 wrist HR with my Rhythm+. Would it be possible to release a second version of this, with a slightly different name, to allow capture of a third HR field ?! I could then compare wrist, Rhythm+ and a chest strap!

Kenny Baldo
den 10 september 2017 | Version 1.1.0-u-upd

Got to say this is a great tool to compare your HR strap to the OHR from your watch. Easily set screen to show both current HR on one screen. I'd like to see a display option for avg lap HR. After several uses. Plus data shows up on GC where you can easily overlay to compare one to another. After several runs the overlay is almost identical with a 2 bps differential on avg HR and 1 pt on Max with strap being the lesser # of the two. This has been tested on various runs, locations, paces and elevations with the Garmin 935. Only thing yet tested on is on intervals where HR spikes will occur and likely the 935 will be substantially off, but maybe the avg works out to the same. We'll see this week.

den 27 juli 2017 | Version 1.1.0-u-upd

Where can I find my heart rate display on my device?

Wolfi L
den 26 juli 2017 | Version 1.1.0-u-upd

Great App, works as it should and allows me to record HR during swim with my Mio Link.

den 14 juli 2017 | Version 1.1.0-u

Thanks for this - works perfectly. Would it be possible to also show the optical heart rate reading on the same display page, for instant comparison? Thanks

den 3 juli 2017 | Version 1.1.0-u

Great data field for allowing you to work how best to wear your garmin to get a decent optical heart rate reading, by comparing it with a chest strap monitor. Nice one!

Peter Holloway
den 31 maj 2017 | Version 1.1.0-u

Perfect for comparing OHR and chest strap performance. The graph and stats are also displayed in Connect IQ after the workout has uploaded. Thanks!

den 27 maj 2017 | Version 1.1.0-u

it's not working on my FR 935. The screen shows "searching" and the optical senzor is not on. it worked very good on my FR 235..

den 24 april 2017 | Version 1.1.0-u

Great! Thanks a lot for this! I don't suppose it's possible to also detect when a strap is enabled on/by the watch and then fish up oHR as aux instead?

den 10 april 2017 | Version 1.1.0-u

Does EXACTLY what I was looking for. However, I would like to be able to access the actual raw data, to be able to extract the Auxiliary heart rate data and compare it up closer. the Connect IQ additional .FIT info is gone when exporting to .TCX and golden cheetah imports the .FIT without the 2nd HR. any recommendations from the Dev?

Svar från utvecklaren
den 20 april 2017, IMGrant

You'll need to download the original FIT file from Garmin, and use tools such as FIT2CSV (from the FIT SDK) or fitdump (from the python package, fitparse), or write your own code to extract the records from the FIT file.

Darren Croton
den 5 april 2017 | Version 1.1.0-u

Works great. Thanks for this!

Lorenzo M.
den 24 februari 2017 | Version 1.1.0

Fantastic, this le t me see my son freq during training!

Svar från utvecklaren
den 25 februari 2017, IMGrant

That's an excellent use case I hadn't thought of!

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