I still am somewhat confused by the read outs and what they mean exactly for terrain elevation. The Chinese translation into English on their site just doesn't cut it. I want to fly over an object on a mountain, namely St. Joseph's Oratory in Montreal, with its varying heights up the hill. What exactly do the three numbers on the waypoints mean? Do I use the height or waypoint height and add the supposed height of the trees etc? I would like to know which of these numbers, if not all, I need to pay particular attention too. This is very very important and I need to know, without any uncertainty, what they mean and how I use them to judge height. Above ground height does that mean above sea level, point at which I took off, or top of a mountain height? Which do I depend on? I'm assuming the height only refers to the hill height and would not include the height of the structure.