I have had what sounds like the same problem. GPS is on and working for all features other than TAP FLY, FOLLOW ME, and maybe POINT OF INTEREST (but have not tried the latter). When I tap the icon to initiate the feature I get the following message on the Ophelia App screen: “ Insufficient Mobile Phone GPS Signal”.
RESOLUTION: After talking to customer service many, many times, I finally got someone that mentioned a setting that I should use on my cell phone. I was told, for the first time, to make sure that AIRPLANE MODE was turned on, and of course LOCATION and WIFI. Sure enough, when I turned on AIRPLANE MODE I was able to initiate TapFly and FollowMe. I will still have to try Point of Interest mode at the next flight.