With this mapping software you used scanned charts.

http://www.oziexplorer.com/

You can calibrate it for GPS.

I highly recommend it. Development version is
free. Get a copy before they stop giving it
away!

I started scanning charts recently, if anyone
would like copies--mine are in grey scale, on
one disk. I'd be glad to make some when I find
time to get my CD driver installed. Or if someone
will burn copies for the group, I'd be happy to
lend my disk out. My goal is to have every US
Caribbean, & Canadian Maritimes chart.

Bart Senior