Minimum connections to make Axiom Sandpiper GPS SIRF NMEA receiver work:

1	ANT_PWR DC power to active antenna. Connect 5 or 3 volts, depending on the active antenna being used. Typically 20 to 30ma. 

2	VCC_5V  Regulated 5.0VDC +/- 5% input power -- 180mA typical. 

3	VBAT    Battery backup input. 2V to VCC + 0.5 V -- 10uA typical.

11	TXA     Port A Serial Transmit Data. VCC CMOS levels -- GPS messages.

12	RXA     Port A Serial Receive Data. VCC CMOS levels -- GPS commands.

13	GND     Ground