Geotagging pictures with Canon EOS 7D - How To?

I was looking to buy the Canon EOS 7D camera because of its new HD video capability, but I also needed a support for geotagging for my pictures. I have been reading on the Internet that the Nikon D90 for example can accept the Nikon GP-1 unit device, which is cheap and does the job for geotagging you images. The problem for me is that in order to get a geotagging capability on the Canon EOS 7D, I