My school has just put me in charge of the school's brand new Phantom 3 Advanced and expects me to use it to take lots of videos in and around the school. The only problem is we are a school in the city, surrounded by tall buildings. If I go to the school roof I can get an unstable 8 satellites and it WILL mark a home point. My question is, what will happen when I am flying around the school and the satellite count drops to 5 (as it frequently does). Does it A. Still use those satellites to maintain any sort of positioning? and B. Will it return to home if it loses connection with the RC?