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The Ultimate Nikon MC-35 GPS cord hack ( As I see it )
Since I made this DIY tutorial much have happened and now Nikon have developed
and released there own integrated GPS unit, the Nikon GP-1 GPS unit Get it here!
Nikon GP-1 GPS unit

Acquired data: Latitude, longitude, altitude, time informationTime required
for satellite acquisition: Approx. 45 sec.
(cold start), approx. 5 sec. (hot start)

Power source: Supplied from camera body

Receiving indicators:
Red blinking (GPS data not recorded)
Green blinking (GPS data recorded utilizing three satellites)
Green solid(Four or more satellites detected, GPS data are more accurate)
Compatible models:D90 (via accessory terminal cable GP1-CA90)
D3, D300, D700, D2X, D2Hs, D2Xs and D200 (via 10-pin cable GP1-CA10)

Attachment:
Attaches to camera’s accessory shoe or a camera
strap via strap adapter GP1-CL1

Dimensions: Approx. 2 x 1.8 x 1 inches
How it looks, my camera (Nikon D200) ready for geocoding photos.
I guess it will work with the New D300 and D3 also
(They use the same connector and are GPS enabled)
 

Parts list: 1ea MC-35 + 1ea BR-355 GPS unit (PS 2 model)
1ea plastic box 60x35x15mm   p/n 50-348-14 (Hammond 1551JBK)
1ea toggle switch subminiature on-off-on type  p/n 35-244-10
Part numbers are taken from ELFA www.elfa.se
Plastic box and switch can also be found at www.Digi-Key.com

Google

Get the BR-355 and MC35 from Amazon.com (Links)

GlobalSat BR-355 Serial GPS Receiver (WAAS Enabled)
Nikon MC-35 GPS Adapter Cord for D3, D300, D2HS / D2X DSLR´s

Or use search string "Nikon MC-35" alt "Globalsat BR-356"
inside the E-bay "search here" box below!
Internal view of the hacked Nikon MC-35
Box had to be slightly modified.
I had to remove the screw posts to make it fit in the box so when
everything was tested OK I simply epoxy glued the box together!
Nikon MC-35 adapter cord hookup to Globalsat BR-355

How it looks inside the BR-355 cord
 

Wire routing by the use of bicycle tire inner tube!
 
Simple schematic of the Globalsat BR-355 + Nikon MC-35 hack
Alternate schematics for GPS connection on Nikon DSRL cameras
On request, an alternative for external GPS power source.
 

[Useful links related to this project]
 
I have not tried any of the diy RS232 solutions but my guess is that
they should work just as fine as the genuine MC-35  :0)

An alternative ready to run solution are now available in a small package the
Geomet'r GPS Receiver for Nikon D200 / D300+Fujifilm S5 Pro [Click here to get it]
I recommend it if you don't mind to lose ability to connect further 10 pin accessories