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Steve writes in about the Sparkfun GPS data loggers, he built a waterproof version - "That unit from SFE is excellent! I packaged one in a waterproof case and use it for recording kayak and boat jaunts... I just nestled the hardware into a carved foam insert inside a SealLine Electronic Case. The wee antenna is lost in the glare; below that is the board, which carries the Lassen iQ GPS, an LPC2138 ARM processor, and a socket on the back with a 256 megabyte SD card. The software strips the NMEA sentences to just the basics, and stuffs them into the card... which has enough space for 440 hours of logging! I haven't checked the power drain yet, but the four 2300 mAH AA NiMH cells should keep it going for quite a while... Photo and the track from a sailboat sea trial are" - Link.
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GPS data loggers, projects and more - Link.
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OK, This is cool and DIY is cooler than buying anything but the damn thing costs at least $140 from sparkfun.
You can buy a full blown Garmin Etrex that is waterproof for $84 from walmart.com. It has a 10,000 point track log. It also has waypoints and a display and it is $55 less!!
Until the sparkfun kit comes downin price a stand alone GPS unit is a better deal.
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I packaged up my logger in a small bit of bubble wrap and some elastic bands, not waterproof like this example but shower proof in the rain and ok for throwing in my pocket etc.
pics here: http://www.flickr.com/photos/marksimpkins/132966514/
and
http://www.flickr.com/photos/marksimpkins/132966376/
mark.
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