It's come down to these 2...
What I have found so far is that the Nav IV is an upgraded version of the 660. What I'm looking for, is to see if the 660 has anything that the Nav IV doesn't?
I am curious about the maps and such. Are they interchangeable?
D
What I have found so far is that the Nav IV is an upgraded version of the 660. What I'm looking for, is to see if the 660 has anything that the Nav IV doesn't?
I am curious about the maps and such. Are they interchangeable?
D


