Well you can only calibrate drone on the ground, where else to calibrate? Ofcourse on a wide open area, but if you get successfull calibration on site and "safe to fly" with full gps coverage, shouldnt that be sign for you that flying is safe? But if it starts to cut off and go in and out of modes on same place flying no further then 50m and no higher then 25m then that is not reliable.
In other words, dont fly drone if there is a any wind and if you are not standing in wide open area with nothing but grass 10km around
Then you will also only need barometer (atti) because other gps modes are just in the way..
In other words, dont fly drone if there is a any wind and if you are not standing in wide open area with nothing but grass 10km around
Then you will also only need barometer (atti) because other gps modes are just in the way..