User Manual

(Thanks Lars)
Input: GPS
Gnd
Vcc
RX
TX
Same pin-put and connector as the Radio / OSD
Make sure you check your gps connections. Some GPS have Gnd and Vcc on the outside pins.
But again the pinouts are for the device and so you connect RX to RX, Tx to TX etc.
APM 2.5 Page 4