Well, here's mine. It's the Navus, from the Mopar accessory catalogue, and is made by Garmin specifically for Chrysler. For some reason, I've never seen anyone else on here comment on them, so they must not be very popular.
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They have a replaceable memory card that can be easily updated. It has touch screen control to make it alot easier to enter addresses, etc. I have been very impressed with it. You can get a remote control for it as well.
Since it is mounted to the vehicle, it displays a vast amount of information pertaining to tips, etc. , including maximum speed, average speed while moving, total average speed, stopped time, traveling time, and all kinds of stuff. It talks to you if you want it to.
It even has a trace function that will recall the last 40 hours or so of driving. ( For instance, if you let someone borrow your vehicle or let your kid take it out, you could see everywhere they drove, everywhere they stopped, how fast they went, max speed, etc. )
It even has very small roads on it, some of which I would more consider 4-wheeler trails. The follow is one of the roads included on its maps... and this was 15 miles from the nearest paved road!
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Installation is very simple. One connector that plugs into your radio harness, and that's all!
Here's some generic pictures of the unit, not from my truck though.
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--Eric