Re: Best GPS unit??????
Garmin 2820: enables you to upload topo maps of your region. It's small and portable to anything with a 12v plug.
Garmin GPSMap 478: has the ability to change from car to boat with XM weather radar. It's way cool. The live radar image is super-imposed over the map and you can watch as you drive in and out of big rain storms.
This one can also be used on battery power if you need to take it out of the car.
Both of these have relatively small screens.
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If it has tires or testicles, you're going to have trouble with it
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