A ship's navigational map is commonly called what?

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For ship navigation, the map used is called a nautical chart. This is a specialized chart produced by hydrographic offices that shows coastlines, depths (soundings), underwater hazards, currents, and navigational aids like lighthouses and buoys, all referenced to a chart datum and projection. It provides scales, bearings, and other details that help sailors plot courses, fix their position, and avoid dangers. A sea atlas offers general reference of sea geography but lacks the precise, up-to-date navigation data needed for safe voyage. A plot plan is typically a layout or diagram for planning spaces or projects, not used for navigating at sea. A world map gives a broad geographic view but does not include the detailed hydrographic information and navigational features essential for navigation. So the commonly used navigational map is a nautical chart.