orbit mode

Hello, What is everyone using to fly orbital flights around POI? I would like to find an app where i can mark the centre of the radius point by pressing a button rather than tapping a point on the map. Mapping can be out ± 30m at times and therefore useless to rely on background mapping...

My Phantom 3 has been working great. However yesterday I tried the "orbit mode". It hovered over what I thought was 10 feet above a tall fir tree. I looked at the controller for a second (to try and figure out why it didn't see the object to orbit)...I then heard a grrr noise and saw it tumble...