reefs

A place for which tidal constants have previously been determined and which is used as a standard for the comparison observations at a second station.

A station for which independent daily predictions are given in the tide or current tables from which corresponding predictions are obtained for other stations by means of differences or factors.

Survey, topographic

A survey which has, for its major purpose, the determination of the configuration (relief) of the surface of the land and the location of natural and artificial objects thereon.

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reefs