'The Northwest Passage' proved so elusive for so long that many sailors and explorers believed it didn't actually exist. A sea route connecting the Atlantic and Pacific Oceans through the Arctic archipelago, it wasn't until Roald Amundsen's 1903-06 voyage that the Northwest Passage's existence was finally proved, but the transit is treacherous and entirely dependent upon the ice giving up its grip for sufficient time to allow vessels through. This is not a journey undertaken by average sailors in small private boats. But David Scott Cowper, 73, is no ordinary sailor. There are seven possible routes through the Northwest Passage, and Cowper had sailed through six of them singlehanded. This is the account of the sixth and most northerly - from ocean to ocean through the McClure Strait, this time accompanied by Jane Maufe, his crew.