I also have the Garmin c330 and it's set on "truck" too,,,,but,,,,it doesn't show you low overpasses or the weight limits on bridges. On the plus side it is about 98% accurate and, like Banditt says, it has gotten me out of some tough times.
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If you can't explain to a 5 year old what you're doing, than you don't know what you're doing.
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