So... I was wondering: I have a Samsung smart watch that is permanently connected to my phone by Bluetooth. Phone's in my pocket, watch is (of course) on my wrist. Bluetooth is 2.4 GHz, and albeit short range at Bluetooth Class 2 (~10 meter) you hold the transmitter in your hands when flying the Phantom (2), also at 2.4 GHz. With the watch being not too far from the Phantom's transmitter, I was wondering, are Bluetooth smart watches a potential source of interference, and is it better to turn it off when flying?