Electronic chart or electronic nautical chart is a
digital graphic representation of a maritime area and adjacent coastal regions.
Depending on the scale of the chart, it may show depths of water and heights of
land (topographic map), natural features of the seabed, details of the
coastline, navigational hazards, locations of natural and man-made aids to
navigation, information on tides and currents, local details of the Earth's
magnetic field, and man-made structures such as harbors, buildings and bridges.
Nautical charts are essential tools for marine navigation; many countries
require vessels, especially commercial ships, to carry them. Nautical charting
may take the form of charts printed on paper or computerized
electronic navigational charts.
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