Think you're confusing a netbook with something else.
The new netbooks are small screened, usually 8"-10" and have wifi, ethernet, usb and either an SSD or legacy drive.
I, too use mine with a Delorme GPS system in my Jeep and it's awesome. There are few other programs I need on it as other than occasional surfing on the couch I have my regular laptop or desktop.
Best part is one with a 16GB SSD and extra gig of ram for $25 put my netbook at about $300.
Yep, and once you are out of range of a broadband data signal, they become useless. That usually only extends few miles past the cities perimeter, depending on the coverage your provider has. Sometimes it can be further, but then you get dinged with roaming fees if it switches to another carriers signal.
Thats probably simular to microsofts street and trips GPS. Should work everywhere as long as you can see sky.
It has Microsoft vista business OS, however, which really sucks. Always having problems with it freezing up, sucking up memory. it's all that security garbage vista came out with that seems to be at the root of it's problems. It would probably be a better machine if it had XP.