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What information is included on a nautical chart?
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map
Topographic map.
A nautical chart is a specialized map designed to assist marine navigators in plotting safe courses and monitoring their progress at sea. These charts provide essential data for the navigation of coastal and marine areas, including:12
- Navigation Aids: Information on lighthouses, radio beacons, buoys, and channel markers.12
- Hydrographic Data: Water depths, including soundings and depth curves, as well as indications of reefs, shoals, and ocean currents.132
- Hazards and Obstructions: Locations of islands, rocks, and shipwrecks.12
- Positional References: Latitude and longitude scales and magnetic information.1
- Coastal Features: Significant landmarks such as promontories, church steeples, and water towers that help navigators determine their position from offshore.2
- Operational Notices: Various warning notices regarding navigational safety.1
Some specialized charts, such as those for small craft, may also include tide tables and information on local facilities. Most modern nautical charts are constructed using the Mercator projection to facilitate navigation.413