What is the measurement shown by the gold arrow called?
A cross-section of the sea. From the top: the sea surface with a yacht afloat, a dashed line labelled chart datum, and the seabed. A gold arrow marked with a question mark runs from the chart datum line down to the seabed.
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Charted depth. Charted depth (a sounding) is measured from chart datum down to the seabed. Add the height of tide to it to get the depth of water at that moment.
