Like most take I take off in P-GPS and after gaining some height and hovering if you flip to ati you get an instant idea of what the wind is like as wind speeds on the ground can vary massively,you can always flip back to p-gps at this point and be confident of what the wind is doing.But if on a long range mission i always use ati as it does increase your speed.
@Rocket_Aus - Thank you for the helpful info. May I ask what kind of speeds you get with ATTI?
As well, switching from P-GPS to ATTI (or vise-versa from ATTI to P-GPS) takes effect immediately after the PAF switch is moved correct? In other words, there's no delay? Liked your post
