MapSource US Waterways & Lights provides a general reference for U.S. nautical navigation aids of lights, buoys, sound signals and daybeacons. Contains US inland shoreline detail for lakes, reservoirs, waterways and rivers with icons indicating boat ramps, dams, facilities, and danger areas. General coastline detail, including thousands of small islands plus wrecks, obstructions and other hazards (no depth contours). Detailed US map with cities, towns, highways, major local roads and interstates.