Add a GPS module inside a MBPR

I highly doubt there is a way to add a GPS module to a MacBook. If you are worrying about tracking a stolen device, Find My Mac through iCloud works fine.

I think this is a better option: Anti-Theft Solution

You may have to find solder points on the logic board that gives the correct voltage to your tracker. It may be 3.3v or 5v. I don’t think you’ll find much info so I recommend looking at schematics (if you know how to read them) or use a multimeter to look for points that will give the correct voltage. Try to use points that are closely related to ac and battery power since I believe those are the best to draw additional current out of. Drawing current from points that lead to other components like the backlight, cpu, etc. may make the board malfunction. I don’t know anything about this on MBPs, I’m speaking from adding 12v led’s and 3.3v/5v glitch boards on Xbox 360s. Which is not the same as you’re trying to do.

I’d love to do this. How about the camera? I never use mine as it is a POS. Double check first, but the camera wire runs from the motherboard and is a modified USB connection with GND, 2 USB data lines, and a 5V power line. Snip it, reroute the tiny cable to somewhere it will fit and hope that it registers as a USB device :-)

See here for more details: http://mikesmods.com/mm-wp/?p=340

Apple cameras (“iSight”, or more recently “FaceTime”, embedded cameras) have been USB based for a number of generations of MacBook, since at least 2006.  Similar to normal USB, the camera connector traditionally contains 5V, GND, and two USB data lines