I was flying some test runs today after getting my P2V back from having some repairs done. I was mainly checking heights of trees and other objects near our flying field. I noticed that after setting the compass and getting ready to take off the Litchi app showed my altitude was about 26 feet. I shut everthing down and started over and the app showed basically 0 feet. I did a little flying around and looked at the altitude of some objects and when I landed in the same spot my altitude was again showing about 26 ft. What gives????? I intend to try some waypoint flying but not sure about waypoint altitudes. I'd like to fly pretty low but I don't need another crash.