I am always playing with maps. And found this new to me site for US Photo Maps (link below). It is mainly topo and road maping software (free of course). It uses Microsoft TerraServer info and appears to be GPS friendly. I am looking at it for Intercoastal mapping but it should work very well for lake sailors. In addition to a gps map plotter, I have a gps usb feed for my laptop. If all this works it will be fun to see the boat on the water moving across the photo map. Gotta do something can't sail all the time. Happy Holidays.