I wont have yhe internet while taking walk outside and i heard it needs gps signal to calculate vo max. Do i need cellular data turned on to measure vo2 max?
No. Cellular isn’t required. The watch GPS is not dependent on cellular network to work.
The Apple Watch doesn’t measure VO2 Max, it estimate it. The Apple Watch doesn’t need internet access to estimate VO2 Max, it only need a good GPS signal.
VO2 on Apple Watch is a joke
it doesn’t measure vo2max at all. it does need GPS data for an eligible activity (>20 minute outdoor runs/walks/hikes) because the estimate it’ll spit out is reliant on some data like distance, pace and elevation that is derived from GPS (and other data points, namely heart-rate). none of that stuff requires a data connection