Hello,
I'm an old Locus user (and beta tester) and I'm happy to see the development of Locus for Garmin.
I have a Samsung A5 2017 and a Gramin Forerunner 235.
As you suggested some post ago I tried this case of use:
track recording and navigation on the phone that receives the heart rate data from the watch and it works.
I think it's not very user friendly but the problem is from Gramin side, I need to go on Garmin options start and stop transmission of heart data if I do not use it for too much time (the smartwatch not the heart

).
Are the fields of track recording's watch-face customizable?
Now I see TIME - DISTANCE - TIME FROM START - CURRENT ALTITUDE.
For my experience TIME needs an own watch-face (as other Garmin apps and watch-faces do) and the 4 fields need to be customizable.
How about to choose the first 4 from the config of locus map recording panel ?
In this way every one can choose the best that fits his habits.
In my case I'd like to see HEART RATE - POSITIVE GAIN instead of TIME and CURRENT ALTITUDE.
Just another suggestion: you did a good job with the data field on the DEVICES watch-face but it's graphically horrible.What about:
Phone ------ Watch
OFF REC OFF
OFF GPS FIX
62% BAT 81%
With Phone column withe, middle coloured, Watch column black.
I also suggest a bold font to increase readability.
Good job I think you did a nice app to make our life easier.