Grounding on reefs, sand bars and other underwater obstructions, damage at the dock if the vessel isn't tide up properly. Tides also create strong currents that need to be dealt with.
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Tides cause water levels to rise and fall.
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Tides cause water levels to rise and fall.
Tides cause water levels to rise and fall.
The gravity of the Moon, and to a lesser extent the Sun, causes tides.
It can be a sign of bad weather