Nikon D300 - Manual (Page 225)

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Using a GPS Unit
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 an optional GP-1
GPS unit (see below; note that the GP-1 does not provide the
compass heading), or with third-party units connected via an
optional MC-35 GPS adapter cord (pg. 200).
❚❚The GP-1 GPS Unit
The GP-1 is an optional GPS unit designed for use with Nikon
digital cameras. For information on connecting the unit, see the
manual provided with the GP-1.