This publication contains a list of lights, sound signals, buoys, daybeacons, and other aids to navigation - USCG
Sailing Directions (Enroute) include detailed coastal and port approach information, supplementing the largest scale chart of the area. Each publication is subdivided into geographic regions, called sectors, which contain information about the coastal weather, currents, ice, dangers, features and ports, as well as a graphic key (above) to the charts available for the area. (from the site)