Hi Ed I don't know of any free charting software, but for $75, you can purchase excellent, full-featured navigation programs that work in all three environments, air, land, and sea. Take a look at the down-loadable demos at www.fugawi.com and www.oziexplorer.com. If you have access to a scanner, you can transfer your paper charts into a digital format that either program will convert and accept. I have all the raster charts for my region so never bothered trying this feature until last week. When I wanted to test the Navman GPS unit at home and had no maps to use as a base, I scanned the local city map. The process is a bit time-consuming, but it works remarkably well. Cheers, Garrett