Originally Posted by brentley

So does this mean that you cannot your insurance or registration cards in the car? Often those have the address, and I know of people who have lost stuff this way as well.

Thief breaks into car, finds registration, assumes no one is home and travels to house (stealing garage door opener as well). This is a problem with or without nav.

In California, you are required to keep your registration with the vehicle and surrender it on demand (different debate) if a peace officer asks for it. If you didn't have it in the car, a thief would not know how to find your house.

Interesting, but narrow tip.