http://www.stormcam.org/gps-portable/
What is the best portable GPS system for driving a truck?
What is the best portable GPS system you would recommend for the conduct commercial truck between states. All boards of truck drivers?
I'm not sure the exact name, but if you go to purchase, or bestbuy.com you can get a PDA that comes with a GPS navigation system in it. For me, it seems to work best, because it serves a dual purpose. The cost is about 200 for the PDA, and 200 for the GPS software and antenna. It is excellent it gives you all the same info that the tom tom and Garmin, and you can also use as a personal computer. The reason Im not sure of the name, because you can buy different brands and models of PDAs. I have one.
Garmin 3790LMT – Easy to Use Portable GPS