SORRY if this has been asked before but I can't find it. I finally got the new app last night so got up this morning the weather wasn't too bad so decided to go outside and try my first flight. I needed to set up the compass as it has never been done before. I followed the manual and instructional videos and everything went as planned, however rather than green flashing mine keeps flashing yellow, there was no warning lights to say that compass calibration has failed it just simply goss back to yellow flashing. Is it possible that there are areas where you cannot get satellite signal? I'm nervous to do any sort of take off before I have GPS as I've never flown one before.