The 10-pin rectangular GPS port on Nikon is very fragile/delicate. Many
owners already experienced
damaged/malfunctioned ports after a short period of use with various
GPS cables and even remote release controller. It is not known whether
Nikon recognized the issue and made the port more robust in later D90
units and D5000/D3100/D7000. Therefore
care must be exercised when handling/using GPS cables.
|DO NOT insert/remove GPS cable with GNC connected to camera. This will exert much downward/upward force on the connector thus putting a lot of pressure on the camera port which will result in damage in a very short time.||Insert/remove GNC only with GPS cable (and/or remote release adapter) connected.|
|D90/D7000 GPS port is at the bottom, GNCGN and NGPA9 GPS cables are just the right length to reach the Hotshoe GPS without stretching or bending.||D5000/D3100 GPS ports are near the top. You can make a small loop on GNCGN or NGPA9 when connecting GN-1/2 or GP-1. Therefore, a shorter cable especially for D5000/D3100 is not necessary.|
|When GNC (or any other connector such as MC-DC2) connected, it is "hanging" on the GPS port, thus allowing up/down and forward/backward movement. It is this movement that damage the GPS port in repeated use particularly in vigorously moving environment.||Put a few rubber band (or similar material) loops on top and bottom of GNC so that when inserted, the top and bottom are in contact with camera body, thus eliminating/reducing up/down movement when cable is in use. This little measure goes a long way to preserving the camera port.|
Connect GNC with only cables designed for it.
DO NOT connect any other cables with Mini-USB connector. e.g. Connecting an ordinary Mini-USB data/power cable to a PC will definitely damage your camera.
If you like to make your own cable for any purpose, this is the pin assigments of GNC port.