Maybe this is a big d'oohh for some of you but it was driving me crazy. I just figured out how to plan a waypoint mission without being connected to the aircraft and leaving it powered on. For some reason there doesn't seem to be a way to just start the Go4 app and get into this without having the aircraft powered up and hitting the "Go Fly" button. So do that, power up everything like you are going to fly. Then just turn the aircraft off. The Go4 app will report "aircraft disconnected" but still allow mission planning. Doing this on an ipad Mini4.