Also, do you have a recommendion on a nav chart program to use on a
laptop? I have Street Atlas, but it diesn't have water depth.

MaxSea offers some software that they declared as fully compatibile with
NavNet. I DO NOT RECOMEND THIS SOFTWARE. It has problems working on many new
computers (and old, ofcourse), specialy laptops. I recomend this software
ONLY if you test it before buying it. I mean a test in a real conditions, on
your boat, and with your equipment.

Good luck.