Today I was flying my drone, trying to get used to it. I wanted to try to fly to a certain spot on the map. When I touched where I wanted to fly to it said something about the waypoint was not in the flying area. Not exactly worded like that but, it wouldn't let me.
There is a limit to the max radius of a waypoint mission, I believe 800m. If you adjust your map size you should have a ring I believe it is yellow. That is the farthest waypoint distance available.