Highest astronomical tide (HAT)

What does "Highest astronomical tide (HAT)" mean?

Today it means: The highest predictable spring tide.

Sailors and especially yachtsman only need to know the highest astronomical tide (HAT) when they need to sail under a structure like a bridge. Charts will show a height for all bridges, cables etc. on a river based on the HAT. A navigator must then calculate the height of tide plus chart datum plus the height of the vessel to determine if it can be passed under safely.

See also: Chart datum  and: Lowest astronomical tide (LAT) 

By SailingQuiz November 2019   Category: Sailing Terms              

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