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A navigational chart is a specialized representation of maritime areas and adjacent coastal regions that provides essential information for safe navigation. It is primarily used to show depths of water, locations of navigational aids such as buoys and lighthouses, and outlines hazards that may impact navigation, such as rocks, wrecks, and shallow areas. This crucial information allows mariners to plot safe courses and avoid dangerous areas while operating vessels.

While tracking ship speeds, calculating fuel consumption, and conducting marine insurance assessments may be important aspects of maritime operations, these functions do not pertain to the primary purpose of a navigational chart. The chart is specifically designed to assist in navigation by providing detailed topographical information and guidance necessary for safe passage through waters.