The Nikon GP-1 requires a cable to the camera both for its power and for data transfer to the camera.
By drawing its power from the camera, the Nikon GP-1 is quite small and there is no extra battery to carry for GPS, but it also means that in order to function, the GP-1 must be connected by its cable to the camera at all times. It’s an awkward arrangement, and brings other complications (with a remote release).
Nikon supplies a camera strap widget that allows mounting the GP-1 on the strap, but advises that this might degrade signal quality due to the orientation of the unit. This seems inappropriate; if one needs GPS, then surely signal quality is of paramount importance. If for casual use, then it’s presumably OK, but why then bother? However, I did not test the signal quality in the field. But I would expect that it could be important under conditions that already impair GPS signal quality such as heavy foliage, or in a canyon.
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