>Well if you don't mind carrying its weight + spare portable power source
>I can't see why not ?
>
>I did have the same crazy idea too before .. SP3 for hiking and it turned
>out .. quite bad 
Hmm.... OK
Well i want a GPS MAINLY for car use..... that is where
it would be most of the time.
However..... I could see myself traveling and walking
somewhere.... downtown Chicago or something.... and
wanting a GPS unit for that as well.
So are you saying that it best to have TWO units then?
One for car and one for personal travel such as walking
or biking?