Potholes, and how to look at them - Alexander McCall Smith

People who go down to the sea in ships, and occupy their business in great waters, as the psalmist puts it, have to attend to navigation.

They do this with paper charts or, more commonly today, with electronic chart plotters, which are much the same thing, but with GPS to show you where you are. These charts set out all the things that sailors are concerned about – the position of rocks and shipwrecks, lighthouses and navigational buoys, and other perils, such as overfalls. In the charts for the seas around Scotland’s west coast, there has been only one stretch of water that has traditionally been marked as being so dangerous as to be unnavigable – the Gulf of Corryvreckan. The message on the charts has effectively been this: don’t go there.

The Corryvreckan whirlpool amounts to a hole in the sea. It almost accounted for George Orwell, when he was staying on Jura, and had a passing fisherman not been able to rescue him, the world would never have had his dystopian warning, 1984. But the important thing is that anybody in that stretch of sea is given full warning by the charts. Further north, where the Firth of Lorne meets the Sound of Mull, the charts will show a more muted warning, with tidal overfalls being marked prominently for anybody who bothers to read the fine print.

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