Fore Flight 9 has "glide advisor" which is a circle around the aircraft symbol which shows your power off glide range based upon altitude and terrain. So if you loose you suddenly find yourself in a forced landing situation and you wonder can I make it to......? If it is within the boundary, you should. I am looking forward to trying this feature.
https://www.youtube.com/watch?v=Z5BQnbIKqh4
https://www.youtube.com/watch?v=Z5BQnbIKqh4