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. With a compatible GARMIN GPS, simply transfer maps from the PC to your compatible GPS unit. Compatible units include: GPS III Plus, NavTalk, GPS 12MAP, eTrex Legend, eTrex Vista, GPS V, GPSMAP 76, GPSMAP 176, eMap and GPSMAP 162/168. Some units may require a GARMIN data card to upload map data.