I set up to shoot some video in a remote location that was surrounded on 3 sides by high cliffs. I was able to get home position recorded but never less than 3 red blinks after the two green. Tried in several locations in the area but with the same results. Two questions: 1. Would it be safe to fly in this situation as long as you stay in ATTI mode? 2. How does the Phantom establish home position without receiving enough satellites?