Check out this web site.
It has a package that overlays Google maps onto the NOAA Charts. This is a prelim demo so it lacks some functionality but it is neat because as you zoom in, the charts automatically change to the correct one for the area you are looking into. You can adjust the amount of each map (opacity) you see by the control sliders on the right side. It is a little slow sometimes. The highlighted areas are the only ones in the system yet, but these French guys are planning to do the world before they stop. Sag Harbor rocks? Zoom over and look ... Great lakes? Zoom over.. Nice!
It has a package that overlays Google maps onto the NOAA Charts. This is a prelim demo so it lacks some functionality but it is neat because as you zoom in, the charts automatically change to the correct one for the area you are looking into. You can adjust the amount of each map (opacity) you see by the control sliders on the right side. It is a little slow sometimes. The highlighted areas are the only ones in the system yet, but these French guys are planning to do the world before they stop. Sag Harbor rocks? Zoom over and look ... Great lakes? Zoom over.. Nice!