I have been going a little nuts trying to find a solution to this problem. Using a Panasonic Toughbook, I want to be able to use the gps navigation in conjunction with topo maps. In other words, I need navigation software that is in greater detail than what the mainstream TomTom type stuff uses, and is compatible with the Toughbook. I have to believe there is something out there, but just can't find it. Any ideas?