Amazon.com: Nikon WU-1a Wireless Mobile Adapter 27081 for Nikon Df, Nikon 1 S2, COOLPIX P530, D3300, COOLPIX P7800, COOLPIX P330, COOLPIX A, D7100, COOLPIX P520, D5200, D3200 Base : Electronics
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
Nikon D3300 Review: Digital Photography Review
Micnova ELELAB07GZPW193 GPS-N Plus High-Precision Camera GPS Receiver Navigation Geotagging for Nikon D3100, D3200, D3300, D5000, D5100, D5200, D5300, D
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
Microphone Adapter Cable Durable Camera GPS Part For Nikon D3100-D7100 COOLPIX | eBay
Alternative GPS module solution for Nikon cameras: di-GPS Eco Pro-S and Pro-F - Nikon Rumors