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.
By SailingQuiz November 2019 Category: Sailing Terms
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Definition of the nautical phrase "Highest astronomical tide (HAT)".