>My company purchased a GARMIN GPS45, a handheld GPS with "computer
>interface" a couple years back for $250. I've seen it listed recently for
>$150 US. The interface is a non-standard data cable (i.e. no DB style). The
>manual offers computer software for boaters, so I'm guessing but there's a
>way to talk to the unit. I never investigated if GARMIN would release the
>protocol.
>
>craig

I also have a Garmin 45. The serial protocol is not that exotic. The web
pages mentioned by other PICers recently can lead you to details on the
NMEA format.  There is a shareware package that you can use to exchange
info with your Mac or PC. As Craig mentioned, the biggest hassle is the
ripoff price for the totally non-standard connector needed to interface the
unit.

Reg Neale