Garmin US Waterways and Lights CD Rom for Street Pilot, eMap, Map 12, GPS III, GPS-48 U.S. nautical navigation aids on CD-ROM Compatible with most Garmin GPS units; see Product Description for details Displays excellent coastline detail plus U.S. inland waterways Small islands plus wrecks, lights, buoys, sound signals, and day beacons Icons indicate boat ramps, dams, facilities, and danger areas