Both Nikon and Canon offer GPS units that can be connected to their respective brand DSLRs, with recent-model DSLRs having built-in menu support with recording options.
With both brands, the GPS units are add-on devices that are designed to be mounted in the hot-shoe of the camera, though both can be mounted to a belt or otherwise with a cable.
For the Nikon GP-1 (about $195), a cable is required both to power the unit and to record data; the unit is a “dumb” unit with no electrical connection to the hot shoe; in the Canon GP-E2 case, both the Canon 5D Mark III and Canon 1D X (and perhaps other models) can use the GP-E2 cable-free with connection pins in the hot shoe taking care of connectivity.
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