The Nikon GP-1 GPS Unit allows you to "geotag" your images with valuable information such as latitude, longitude, altitude and time information. For those who are on the go such as outdoor photographers, nature shooters, climbers, sports enthusiasts, news hounds, surveillance people, real estate agents and many more, this item provides a valuable way to accurately document when and where you shot a specific photo.
Nikon sells the NIGP1 as a geotagging device. It comes with a 10 pin connector to transmit the data to D200, 300, 300s, 700, D2, D3 and D800 / D800E. However, when using this, the 10 pin connecter for the camera is occupied and does not allow you to use a Nikon MC30 or MC36 remote cord. However, this problem is easily solved. The Nikon remote cord for the D90, the NIMCDC2, can be plugged into a second port on the NIGP1 thus allowing you to take photos without touching the camera.