Chart datum

US civil and maritime uses of tidal data

A chart datum is the level of water that charted depths displayed on a nautical chart are measured from. A chart datum is generally a tidal datum; that is, a datum derived from some phase of the tide. Common chart datums are lowest astronomical tide and mean lower low water.

单词	Lowest Astronomical Tide
释义	Lowest Astronomical Tide 英语百科 Chart datum A chart datum is the level of water that charted depths displayed on a nautical chart are measured from. A chart datum is generally a tidal datum; that is, a datum derived from some phase of the tide. Common chart datums are lowest astronomical tide and mean lower low water.
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Lowest Astronomical Tide

Chart datum