I'm still using the older Garmin Descent Mk2 model, which is basically equivalent to the Mk3 for diving features. (I might upgrade to the Mk4 when it launches l

I'm still using the older Garmin Descent Mk2 model, which is basically equivalent to the Mk3 for diving features. (I might upgrade to the Mk4 when it launches later this year.) It sure is handy to have a single smartwatch that can do everything. We use a variety standard breathing gas mixes for the depth range based on limits imposed by density, narcosis, decompression time, and oxygen exposure.