The Nuts n Volts column linked to below has an article about grabbing and interpreting the serial strings from a Garmin GPS. The wiring is pretty simple, but you will need to purchase (and cut) a serial/Garmin cable or buy just the Garmin connector (you can obtain these for about $15-$20 from the Garmin site or any local mapping/surveying store.
The programming isn't too complex, but given the time to read and then interpret the serial data from the Garmin, your program may not have time to do anything else quickly.
Kitman
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The programming isn't too complex, but given the time to read and then interpret the serial data from the Garmin, your program may not have time to do anything else quickly.
www.parallax.com/dl/docs/cols/nv/vol4/col/nv103.pdf
Parallax also sells a standalone GPS module to use with any microcontroller:
www.parallax.com/detail.asp?product_id=28146
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