Search for E-OSD at hobbyking.com. It's a small logic board (1.5inches by 0.5 inches) that outputs the battery voltage onto your FPV monitor/goggles. IIRC, it cost around $10-15.
I bought one of these http://www.ebay.co.uk/itm/Real-Time-Portable-Personal-GPS-Tracker-GSM-GPRS-Car-Pet-Tracking-Device-Spy-Bug-/270992943595?pt=UK_In_Car_Technology&hash=item3f187029eb for £29.99 (UK), added a £10 pay as you go sim card, velcroed it to the underneath of the Phantom and it's...
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