you can get the maps free from NOAA, BUT
they are in a format unreadable by Raytech and the like. Their is a utility that converts them to standard format, and i used to have a copy, but my HDD crashed and i lost it. Luckily i had the maps i use (lots of south Florida and some world maps) on CD-R. If anyone wants to trade map libraries, just email me, I have a big web server, my libary is 127mb.. All my maps are in .geo and .nos formats (readable by Raytech Navigator, Captn, etc..)unwiredone2003@yahoo.com