After my search, I settled on the Solmeta Geotagger N2
" After my research, including emails sent to the various manufacturers of various GPS units for Digital SLR's asking specific questions, I settled on the Solmeta N2 GPS unit for my Nikon D300. Rather than go into a long list of specifics on this unit, just follow the link to Solmeta where you can view and read the information on your own (no sense in reinventing the wheel). Aside from all of the features of the N2, two of the reasons I decided on this unit was it's versatility in that different cables connecting the unit to the camera can be purchased in the future if I ever need a different connector than what I am using now, and it's two year warranty". Read More..