Pushed Off Course

If no allowance is made, the tidal stream will push this boat away from its objective. The tide's strength and direction determine how far off course it will be.

TIDES 243

TIDAL CURVES

Annual tide tables give times and heights of high and low water at larger ports round the coastline, known as standard ports, for every day of the year. They are published in nautical almanacs, which include tidal curve graphs. Tidal curves illustrate a cycle of spring or neap tides and can be used to calculate the depth between high and low water at any specific time. This can also be done using an electronic tidal calculator or a web-based service.

during spring tides than during neap tides. Its direction is known as the tidal set and its strength is called the tidal drift; both of these values will change throughout the tidal cycle. Information on tidal behavior for specific areas related to a standard port can be provided by charts, tide tables, tidal atlases, nautical almanacs, and electronic chart systems.

Areas with a large tidal range may have tidal gates—regions where the tidal stream intensifies, typically due to the stream accelerating round a headland or passing through a narrow passage—that "close" at certain states of the tide. In extreme situations, a 33-ft (10-m) yacht motoring flat out at 8 knots may be brought to a standstill or even driven backward by the stream. It always makes sense to time your passage with the tide. TIDAL STREAM ATLAS

-6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 Before high water After high water

-6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 Before high water After high water

Charts show the lowest predictable tide, or chart datum (see p.239), whereas nautical almanacs show the average heights for high and low water.

The tidal stream is a horizontal flow of water created by rising and falling tides. The stream flows much faster

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