When I click 'what's this' next to 'activity class' setting for my VHR, I get sent to web address
https://connect.garmin.com/modern/device/3927923449#activity-class
which does not appear to exist?
I'm sure there used to be some data on what the various classes correspond to, activity wise.
Or maybe the latest VHR firmware doesn't use this value any more (to calculate BME calories)