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We have a GPS unit that has a cable that plugs into the (I believe--its been a while since I have been home and used it) serial port. Along with the Garmin map software, it works very well. We navigated our way around a bunch of unnamed dirt roads in the middle of nowhere with it. Good times.
Just make sure you have map software, its almost worthless without it. And a car adapter for the laptop and GPS are a must as well--dont want the batteries dying on you. And make sure someone else is doing the navigation while you are driving.
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"Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws."
--Plato
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