This has probably been asked 1000 times before but I can't find a documented answer (that I can understand). When using ground station is flight altitude AGL or relative to the home point altitude? For example, if I take off from the top of a hill and climb 30 meters and then proceed to fly over a valley does the bird drop down to 30 meters above ground level or would it fly at the original height until I changed the altitude with a waypoint? I think the answer is it would stay at 30 meters above my home point but I want to confirm. Thanks.