lots of good information, i thought that i would use it just to learn how the darn thing works. Have had it for some time and have never taken the time to sit down and really learn it. have a 17 ftr runabout and don't really get away from port or my home waters all that much but am getting that two-foot-itis and have been looking at some bigger boats lately and will have to learn all about the navigation type stuff. so you see i am just a newby at this type of thing, but i know alot about computers so should be able to figure it out. all great advice, thanks so much, Fishy