Chart datum

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Definition of Chart datum (CD):
The level to which both tidal levels and water depths are reduced. On most Admiralty charts, this level is that of the predicted lowest astronomical tide (LAT).[1].
This is the common definition for Chart datum (CD), other definitions can be discussed in the article


  1. CIRIA (1996). Beach management manual. CIRIA Report 153.

See also

  1. Bathymetry
  2. Tides