The map stored itself automatically to my extSDcard.
it's under
data/com/garmin.android.apps.viago

The map itself is an .img file

it's named
02338160a.img
It's the complete north american map.
it's 2.15 gb in size

There's also a jvc folder, as well as a gmapbmap.img
it's only48.64mb

I hope this helps.
I'm on my way to take my mom to the hospital for surgery. I'll take my laptop with me. If you have any more questions, I'll try to answer them when I can.