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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