chart—A nautical or aeronautical map designed for nautical and aeronautical navigation purposes, and to maps of the heavens, although the term is sometimes used to describe other special-purpose maps.

chard, admiralty—Hydrographic charts of the British Admiralty.

chart, aeronautical—A chart designed for use in navigation through the air above land or water. An aeronautical chart shows aids and hazards to navigation. An aeronautical chart has been variously designated as an aerial navigation map, air navigation map, aerial map, aviation map, aviation chart, and air navigation chart.

chart, bathymetric— A topographic map of the bed of the ocean. Bathymetric charts show depth curves, with areas between the curves given significant colors. Bathymetric charts are designed especially for geophysical (oceanographic) studies, but can also be used for navigation purposes.

chart, current— A chart on which data relative to currents are graphically depicted. Current charts published by the National Ocean Service for a number of important waterways consist of sets of twelve charts each of which give the direction and velocity of the current for each hour of the tidal cycle. These charts present a comprehensive view of the tidal-current movement in the waterway for navigational purposes.

chart, isogonic—A map showing isogonic lines.

chart, isomagnetic— A chart showing the configuration of the earth’s magnetic field by isogonic, isoclinic, or isodynamic lines.

chart, isoporic— A chart on which lines connecting points of equal angular magnetic change are drawn.

chart, magnetic—¹ A special-purpose map showing the distribution of one of the magnetic elements such as local deviation of magnetic north from geodetic north. ² A special-purpose map showing the distribution of the secular change in one of the magnetic elements.

chart, nautical—A representation on a horizontal plane, and according to a definite system of projection, of a part of the navigable waters of the earth, including the shore lines, the topography of the bottom, and aids and dangers to navigation; it may be derived from hydrographic, topographic, or aerial surveys, or a combination thereof. Also referred to as “hydrographic map.”

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Source: NSPS “Definitions of Surveying and Related Terms“, used with permission.

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