Blue2CAN is an integrated solution for GeoTagging digital still images with GPS data. Using a BlueTooth enabled GPS unit and industry leading Nikon D200, D2X, D2Xs or D2Hs, Blue2CAN allows users to directly capture geospatially referenced images in the easiest, most reliable collection method today. Geo-spatial information (Lat, Lon, UTC etc.) collected from the GPS receiver is encapsulated in metadata tags of every image taken. For JPG files the geo-spatial data is contained in the industry standard EXIF tags, for RAW files the metadata is maintained by RAW image workflows and is put in EXIF tags when RAW files are converted to JPG.

For 279 dollars it's a bit high ... the serial cable for GPS that Nikon sells for less than 99, but you still need a GPS both ways...

Great idea for Geo Caching!

Blue2CAN