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Micnova ELELAB07GZPW193 GPS-N Plus High-Precision Camera GPS Receiver Navigation Geotagging for Nikon D3100, D3200, D3300, D5000, D5100, D5200, D5300, D
JYC N-769/N3 Camera GPS Receiver Geotag GP-1 + JYC wired shutter release SR-C1 for Nikon D90/D3100/D3200/D5000/D5100/D5200/D7000/D7100 | Eachshot.com
GP-1A GPS Unit | Nikon
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Nikon D3100 - Wikipedia
New Aokatec AK-G GPS receiver for Nikon DSLRs | Fstoppers
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
Foolography bluetooth GPS connectors for Nikon D90 and Dx000 unleashed: Digital Photography Review
Micnova GPS-N Plus GPS Receiver for Nikon Cameras | eBay