Nikon D4S - Manual (Page 260)

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Location Data
A GPS unit can be connected to the ten-pin remote terminal,
allowing the current latitude, longitude, altitude, Coordinated
Universal Time (UTC), and heading to be recorded with each
photograph taken. The camera can be used with optional GP-1
and GP-1A GPS units (see below; note that these units do not
provide the compass heading), or with compatible third-party
units connected via an optional MC-35 GPS adapter cord (
0 413).
❚❚GP-1/GP-1A GPS Units
These optional GPS units are designed for use with Nikon digital
cameras. For information on connecting the unit, see the manual
provided with the device.