a. General. Coastal hydrographic features and notes pertinent to those features usually are shown on all sheets showing navigable waters. Sheets showing land areas bordering on inland bodies of water, such as lakes, contain only offshore data. Sheets showing land areas bordering on oceans, seas, bays, or similar bodies of water contain both offshore and foreshore data.
b. Definition of Coastal Terms (fig. 82).
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(1) Coastal hydrographic features. All features within the foreshore and off-shore areas, including permanent cultural and natural features which affect the navigability of the area.
(2) Foreshore area. That area which is bare or awash at the hydrographic datum (low water) but which is covered at mean high water.
(3) Offshore area. That area which is covered at the hydrographic datum.
(4) Hydrographic datum. That stage of low tide to which depths are referred. This varies somewhat in different parts of the world.
c. Symbols. The following contain the approved symbols for coastal hydrographic features.
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