My friend has a Garmin GPS and he downloaded a custom navigation direction arrow in a shape of his car. Is it possible to do similar stuff with the Avic?

I just installed Garmin XT on my phone and swapped the arrow, too. I would think that it's quite possible on the D3...it's just a matter of decrypting the disc, finding the file & format, and then drawing a new file of the same format. Is it something that I can do? Nope.