are all gps devices "alike"?

[robfilms]

michaelb-

thanks for sharing your obvious experience w/hiking gps systems.

i am indeed looking for a car based gps unit.

i may have confused the situation by wondering if i can use the car based gps on my runs. i am not trying to murky the waters any more than i have obviously already have.

i am hoping to find a decent car based unit and my initial query as to what to seek in a gps is for a car based system.

again, thanks for sharing your thoughts

be well

rob