Since I recently bought a Tundra that came with the 7.1 version of the navigation software, I was interested in unlocking that version. (It does not have the annoying I agree screen.)
So I stumbled upon a post by WileEtundra where he made a "speed pulse generator" to fool the navigation into thinking the car is not moving.
So I decided to make one. I have not installed it yet, but if you are interested here are the details. (see the following link)
http://www.tundrasolutions.com/forum...-2/#post794102