Here is a link to a good source of maps for downloading. So far they are the best maps I have been able to find online. If you open them in adobe reader you can adjust whether topographic data is displayed, satellite imagery or both. They also display grids in US National grid, which is the civilian name for the Military Grid Reference System. As far as I can tell it is the exact same. As a warning these maps are quite large. I printed mine shrunk onto an 11×17 piece of paper, which is still quite usable for land nav.