Very true it is expensive, sometimes they run a $99.00 perstate sale. I have Illinois and Indiana.

There are some quirks in Terrain Navigator Pro that I Don't like. the file system is strange some drawing features are a pain. But for the most part It works well in a SAR environment.

I have used Delorme and Street Atlas and National Geographic, I guess NG was the best of the three for me. But the user interfaces and no UTM, limited printing was a dissappointment.

Even our $30,000 GIS system at work is not perfect. All I can suggest is try before you buy if you can.