Here is a link to Navionics. The maps you buy cover a region.
http://www.navionics.com/LakeMaps.asp My handheld is an Eagle Explorer (don't know why I thought it was a Lowrance). It has no map features. It just shows your trails,wpts etc. It's pretty basic but works well. I even have a cig. lighter adapter that I used in my boat b/c it eats batteries like candy.
I'll sell it all for $50. I even have the book around here somewhere.
