Aviator Gen2 and flight tracking

Dear all,

I started to use my Aviator Gen2 onboard of commercial planes to track my flights as passenger. However I do not get correct data as the GPS is not working while on cabin.

for the ones that use the watch in the same way, what is the best process to track correctly flights? do you start your gps before boarding so to have access to signal?

what about altitude? normally is locked to 1500-2000mt due to cabin pressure. Any idea on how to have realistic data?

thanks