Using Litchi on my P2V and trying to do waypoint flying I've noticed that my altitude at waypoints is much lower than I intend. Playing around I find my altitude at "home" where I set the GPS and compass shows about 29 feet. When I reach waypoint one which I have set for 100 ft. I'm flying around 42 ft. Even doing the math to compenste for my starting being 29 ft. it's still off. 100 ft. - the 29 ft. should have the bird at 71 ft. I'm flying in an open field with a few trees and flying lower than where I set my waypoints could be a problem. I'm trying to accurately determine what altitude to set. Of course I could set waypoints to avoid the trees but in the future I'd like to know exactly how this works. Can I manually set my "home" position to zero and be able to count on the waypoint altitudes above the "home" altitude to be accurate?