Sad situation to hear Chris,
I have a GPS logger. It is a separate device that logs your position every 10 seconds and provided your camera's time is correct, you can sync the position log to your photos. Mine was about $120, and uses a rechargeable battery that lasts about 40hrs. The battery is the same as in an old Nokia mobile phone, so easily replaced (for a couple of years I guess!).
Unfortunately it's not a super simple process. One bit of software to download the GPS log file and another (Lightroom) to sync it to the photos.
As far as I can tell from a quick web search, you need a 5DIII to use a genuine Canon hotshoe GPS reciever that will add the GPS coordinates to the EXIF data when you actually take the shot.
DT
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