Technology has revolutionized most things in life, so why not use it to improve your fishing and boating adventures as well? The Navionics Regions East Region Marine and Lake Charts and Maps have detailed nautical charts and SonarCharts of the lakes and coastal waters from Maine to Illinois to South Carolina and everything in between. These charts come in an MSD format and include an SD adapter for easy viewing, and they utilize GPS technology to show your location on the map and depth.