Name: Auxiliary Heart Rate v2
Rating: 4.9 (16 reviews)
Author: FlipStone

This is a clone of the Auxiliary Heart Rate app by IMGrant

https://apps.garmin.com/en-US/apps/88ce4547-7d84-4289-b2c7-3e15ca00185f

It was specifically built for the FR945 as the original is not available for it... But added supported for other (and all) models as well in order to keep it available for new devices (and make maintenance easier).

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.

A simple data field that connects to ANT+ heart rate monitors, displays heart rate (in bpm), and records it into the FIT file, mainly intended to compare with the internal OHR.

Has 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).