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We got one it works great..It is a Garmnan with N.route software.There are several brands with several software bundles.They all do pretty much the same thing and they all work great. Look for the best price should be able to get a good unit for @ 100$ or less..Check out best buy, Wall mart, etc. Roger on the USB port and No external power supply.Most of them have a magnetic mount for the roof of your truck and are water proof.They are extremely accurate. I moved my truck in the driveway and the unit informed me that I had traveled 8.3 feet..which I did.
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