THE UK'S 11 FIERCEST TIDE RACES

Breaking waves and lurking rocks have earned some British tide races a fearsome reputation. Dag Pike explains how to navigate them

- Dag Pike

The British Isles lies in one of the most turbulent maritime regions in the world. Not only are our shores battered by the depressions that roll in with frequent monotony during the winter months, but every 12 hours the tide turns and billions of litres of water move in and out from our shores. This huge water flow fills and empties the English Channel, pours up into the Irish Sea and on up and down the West Coast of Scotland and up north it finds a way around the islands to enter the North Sea.

The tidal streams generated by this flow can be fearsome, running up to 10 knots in places and when the land gets in the way, impeding the flow of the tide, tide races can generate wild seas that can prove a significant hazard for sailing yachts, with short steep waves, where you can barely recover from one wave before the next one hits you. In benign conditions this need hardly trouble you. Where the seabed rises suddenly, tidal flows are concentrated around headlands or through narrows, and if the tide and wind are opposed, then swell with a long wavelength in open water will slow down and concertina up, making the waves build in height, with much steeper faces, crests that are much more likely to break and with the ability to swallow boats whole. You don’t want to get it wrong.

TACKLING A FEARSOME RACE