Most common is NMEA. It's 9600/8n1 serial communication, ASCII text. Quite
easy to handle. Just google for NMEA and GPS and you'll bound to hit
something. But it's so simple, just looking at it will probably do as well.

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Has anyone used a PIC to communicate to a GPS module?

Any info on what data to expect?

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http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.