i wish to fly my P3A inside a warehouse. now i understand that i will probally have to be in Atti mode with VPS switched on. i have used atti mode several times outside and quite confident that i control in a confined space. now when i fire everything up and switch to atti mode (or GPS mode) it won't let switch the motors on. keeps coming up with compass error. now im inside a metal building so i expect this to happen. i was under the impression that this shouldn't mattter as im wishing to fly in atti mode? maybe im wrong? i thought, hey i just won't callibrate the compass as i won't be going any further that 20 feet away. question is, how do i fly inside on atti mode with compass error? or can i not?