Lowest astronomical tide (LAT)

What does "Lowest astronomical tide (LAT)" mean?

Today it means: The lowest predictable spring tide.

Navigation charts show a depth which is known as chart datum and used to calculate what the actual depth of water will be once the height of tide has been added on. Chart datum is based on the lowest astronomical tide which would be the strongest spring tide predictable.

See also: Chart datum  and: Spring tide  and: Highest astronomical tide (HAT)

By SailingQuiz November 2019   Category: Sailing Terms              

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