Hello I just got a Phantom 3 Standard yesterday. After doing the checklist to get started it seems to drift all over the place. I've calibrated everything also. It has between 7 and 10 satellites but it never gives me the green flashing lights just the yellow lights and at the top of the app it says safe to fly non gps. If I use auto take off the app records the spot and the status switches to green and says safe to fly gps but as soon as it gets off the ground it switches back to safe to fly non gps. Is there something I am missing in my pre flight checklist? If this sounds confusing just let me know and I can try and reword it. Thank you.