I live in S. Florida and between swimming pools, man made sub division lakes, and of course the real Ocean, Inter coastal waterway, and larger lakes it's hard not to fly over water. I'm not an expert of the self landing mode, I just fly back to land near my feet. I'm pretty sure you should check out what happens if you fly below your take off altitude. (if you are on a hill overlooking a lake and fly down to the water.) Don't want the drone to think it's landing. I'm sure someone will answer this thread with the simple answer.