Boating Basics: On the Water

Tides on Coastal Waters

High tides and low tides normally occur twice daily each, at approximately six hour intervals.

Boat operators in coastal waters need to be mindful of the effect of tides.

• The rise and fall of tides can cause water levels to fluctuate by several feet and also can cause strong currents. This can cause vessels to run aground in areas where earlier navigation may have been safe.
• Tides also can affect docking to a fixed pier.
• Tidal currents can be strong enough that some vessels are not able to make headway against the current.

Never go overboard in coastal waters without a PFD. Many lives are lost from going overboard and then being unable to swim back to the vessel against the current.

As a boat operator, you need a knowledge of the tides in your local area. It is a good idea to learn how to read tide tables found in many newspapers in coastal areas. Tide schedules can also be found on weather radio channels.

Winds and Currents

Winds and currents can change a vessel’s course. Always allow leeway for current and wind.

• A vessel that sits deep in the water will be affected more by current than wind.
• A vessel that rides high in the water will be affected more by wind than current.

It is easiest to handle a powerboat in a river or stream by going against the current. If you must go in the direction of the current, you must go faster than the current or you will not be able to steer the vessel.