In my case, I use the GPS module to a 5D MK III, which communicates with the module directly via the hot shoe. This coupling is of course particularly convenient, because you can actually leave on the camera module on trips ever.
However, a coupling via digital interface is possible with the 5D3 (and in the 7D, the only way of communication, the hot shoe does not work there).
Dobra you can attach the module, for example, with an attachment angle of the camera, or carry in the pocket or hand.
Because of the 5D3 did not fire is built, I use them like driving to lighten the little 270EX flash. Therefore, the cable option is quite welcome.
After plugging in and plugging and turn on the camera and the GPS receiver, the GPS Menu "GPS" Device Settings "active and you can make verscheidene settings:
Automatic retrieval time to adjust the camera time
Refresh Interval
Digital Compass.
The data received from the satellite can be displayed.
The acquisition of the satellite is very rapid in good weather and in many cases also works in enclosed buildings. Are detected length / width / higher above sea level and speed.
Conclusion
The device is extremely easy to install and works very reliably and quickly. However, it is somewhat clunky and the question is therefore whether it really always been attached in field operations. A supply of energy from the hot shoe I would have preferred, as another battery to which one must think the move.
While it is possible, even retrospectively record the GPS information to the photos, but who will score a lot of pictures and that makes consistently, thus has a considerable amount of work.
I believe, therefore, that anyone who wants to have GPS data in his paintings, with the GP-E2 is better served.
+ Fast
+ Reliable
+ Easy operation
+ - Relatively expensive
- Something clunky
- Separate power supply required
NOTE: Those who wonder why the part so hard triggers the hot shoe, which should press the small button next to the release lever. I have just seen. : O)
