Kneepuck
Second Officer
Flight distance : 275105 ft
United States
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Well, to be honest, I have never used the auto land feature. But the manual says to initiate auto-land and then follow the instructions on the screen. I am going to go out on a limb and say that the instructions will probably say for you to navigate to the area above where you want to land and then press ok, or some such. The Phantom will complete the landing the same way it knows to shut the motors down when you have full stick down. It knows, because despite the command to descend, it is unable to descend further because it is on the ground. After a couple seconds of that, it turns off the motors. To put it more simply, when you press auto land, it begins landing straight down from where it is, until it can descend no further. Not the same as an rth at all. The altitude displayed on the screen is really just a reference for our convenience, especially as far as negative numbers goes, if you see what I mean. Yes, the Phantom uses the barometer to limit height above the home point, but it does not care if you are lower. It also does not care if you take off , as I do, climb to 10 feet above home point and immediately fly out over a canyon that is a couple of thousand feet deep. It still thinks you are at 10 feet above the home point.
**** Additional edit****
Now that I think about it, I have landed manually 30 feet below my home point with no problem.
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