Jrhoffman75 wrote:
GP-E1 is for Canon 1D X cameras. It connects to an accessory port on the camera. GP-E2 can connect via hot shoe to a number of Canon cameras, can connect via a cable to some, and when connected will geotag photos. GP-E2 can also be used as a data logger without camera connection and geotag photos using software. This requires accurate setting of camera time.
Thanks for helping clarify.