To hook up a
gps or similar eqmnt to a computer, you must find the
nmea out port.
For the
garmin the output is wired into a multicore cable (according to the manual):
http://static.garmincdn.com/pumac/33...ctions_EN_.pdf
Here you should use the tx wire (blue) and ground (black) and connect it to the
serial input (com) port of your pc.
This connector should be a 9pins connector, where the nr 2 pin is rx and nr 5 is gnd. (google for 9p sub-d or rs232)
If you set the
nmea output to on and in most cases 4800baud, your pc should receive the data (check with hyperterminal, you should see strings like: $GPGLL...etc)
If you don't have a
serial input on your computer, there are usb to serial adapters
for sale...
Good luck