di-GPS Eco ProSumer GPS for Nikon - Terry White's Tech Blog
Micnova ELELAB07GZPW193 GPS-N Plus High-Precision Camera GPS Receiver Navigation Geotagging for Nikon D3100, D3200, D3300, D5000, D5100, D5200, D5300, D
Alternative GPS module solution for Nikon cameras: di-GPS Eco Pro-S and Pro-F - Nikon Rumors
Amazon.com : GPS Receiver Compatible with Nikon, Micnova GPS-N Plus DSLR Camera GPS Unit Navigation Geotagging for Nikon D800 D3200 D3300 D90 D7100 D5200 D4 D600 D5100 : Electronics