"I got a GPS" - sounds like you've picked up a nasty disease...

What's wrong with calling them "satnavs"?

I love mine, I set it to avoid all the big roads and I find places you never knew existed, and get there just about as soon.

And for fun you can always defy her, and turn left when she says turn right, and that way you can get to even stranger places - and still get where you want to go in the end.

I'm looking forward to the day you can set them to be proper back-seat drivers - tell you you're going too fast, and isn't it time you got some petrol, and have you remembered to do the shopping...