A few other percs:
In several software programs (not Lightroom 4 or at least that I could find) the GPS data is populated with longitude, latitude and altitude as shown in the attached screen capture. Also, note the Globe icon on the thumbnails. This program is ACDSee Pro version 5. They still have not yet developed the codec for Canon 5D Mark III RAW files however. In Canon's DPP version 188.8.131.52 while viewing an image and by doing a CTRL + I you can see the following popup (image GPS2) with also the same coordinates. When you use the GP-E2 on the 5D Mark III rear LCD you can select the compass mode and know precisely where you are
Additionally, when uploading the file to web sites such as Panoramio.com, google earth, yahoo's flickr the site automatically grabs the metadata and accurately places the file. The Map software that comes with the GP-E2 is also excellent as you drag and drop the encoded image and watch it placed precisely where the photo was taken. It also has a Log mode for just walking around and tracks your path. It comes with a short 4.8 cable that can attach to the 7D to encode its files as well though that won't be released (firmware) until August.