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Topics - ryebrye

#1
The GP-E2 on the 7D lacks some of the features it has on the other supported models.

One of the more head-scratching ones is it doesn't let you sync your camera clock to the GPS time... but it clearly shows you the time from the GPS on the info screen and it records the GPS time in the EXIF of every shot.

It also doesn't let you use the compass on the GP-E2, which I suspect is also an arbitrary limitation (but this one I'm assuming they imposed because you're not likely to have the compass mounted on a flash bracket or in the hot shoe on a 7D so the compass might not be very reliable)

The lack of tagging videos with GPS data is less of an issue to me - but also seems like a very arbitrary restriction.

... but at the very least - I imagine it would be simple to just enable a "sync camera clock to GPS time" button. I'm at the very least interested in knowing if there is any sort of technical reason Canon wouldn't have enabled that feature on the 7D but did on the rest of the GP-E2 supported cameras.
#2
I'm interested in automatically geotagging, but less interested in spending $250 for a GPS unit with a USB connection. Does the GP-E2 do USB host or does the camera?

If the camera is the USB host, making something that would emulate the GP-E2 and send GPS info to the camera would be pretty easy - I have more than a few older android phones with good GPS receivers in them and functioning USB ports that I could use...

Or perhaps building an arduino-based alternative to the GP-E2 would be another idea.

Anyone know where in the firmware it shows the protocol used to talk to the GP-E2?