I am going to fly my P3 in a building with 20' high ceiling. I have it set to A Mode. If for any reason the P3 initiates a RTH, if it has a GPS signal it will fly up 30M and return home. My problem is that inside this room it acquires a decent GPS lock, so how do I tell it to just hover, or do I have to set the RTH height to be 10'. (if I don't reset it I could have a problem next time I am flying outdoors.