How are tidal heights important in navigation?

Tidal heights are crucial in navigation because they directly influence water depth in coastal and navigational areas. As tides rise and fall, they can significantly change the depth of water over underwater features such as shoals, reefs, and channels. If a vessel is not aware of whether the tide is high or low, it risks running aground in shallow areas or not being able to safely navigate through narrow passages, especially if the depth is marginal for the vessel's draft. Understanding tidal heights enables navigators to plan their routes effectively and ensure safe passage, particularly in regions where tide variations are significant. Accurate tidal information helps in making informed decisions regarding when to enter or exit ports, as well as when to navigate through potentially hazardous areas.