Both the Garmin HRM Pro and Stryd Duo produce RD (running dynamics) data during a run. My question is: when using both devices on a run, only one of them is used for some fields in the resulting FIT file, but which one is it?
Specifically, both devices produce "vertical_oscillation", "stance_time", and "stance_time_balance" (and possibly some other fields such as "vertical_ratio", "stance_time_percent", etc). The FIT file contains lots of information about the devices, but I can't see where it lists which device is responsible for which data field. My testing seems to indicate that the Stryd takes precedence over the HRM, but it would be nice to have confirmation.
This ambiguity affects other fields, e.g., "cadence" and "Cadence" can come from the watch, the HRM, or the Stryd. Is this clarified somewhere in the FIT file, or is it only known by the watch software?
