Super late reply but to clarify, that board just has a GPS antenna and receiver, it has no NMEA output, just raw digital radio data.
The pinout is as follows:
VCC
GND
RX_EN
Clock
SIGN
MAG
To be able to make any use of the GPS signal out of that receiver, you need to connect it to a baseband radio processor. In the Magellan, it's the SiRF Atlas III residing on the middle of the main PNA board.
So that board, as it is, is no useful outside of the original GPS device.