MK2 in Apnea mode should have option to change minimal depth to start dive.
Actual depth settings are fixed 1.2 meter for descent (start dive) and 1.0 for ascent (end dive).
This values are useless on swimming pool training DYN, DNF, BiFins on shallowed pools.
Garmin should add this function to settings or create new activity Apnea Pool with fixed setting 0.5 m for descent (start dive) and 0.3 m for ascent (end dive).
