A nautical map, also known as a CHART, is a navigational tool used by sailors and mariners to help them find their way on the open seas. It is a two-dimensional representation of the Earth's surface, showing the depths of the ocean, the location of land masses, and other features such as lighthouses and buoys. The CHART is an essential tool for safe navigation, providing information about the water depths, currents, and other hazards that may be encountered.