Definition
The United Kingdom Hydrographic Office publishes a worldwide series of numbered volumes, each covering a defined region, giving descriptions of the coastline, landmarks, tidal streams, port facilities, pilotage requirements and local regulations, with photographs and views. They amplify what a chart cannot show. Volumes are reissued periodically and updated by annual supplements or by Notices to Mariners. The United States equivalents are the NGA Sailing Directions, split into Enroute and Planning Guide volumes.
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