High Latitude Sailing, Self-Sufficient Sailing Techniques for Cold Waters and Winter Seasons By Jon Amtrup and Bob Shepton Hardcover, 198 pages, $35 Adlard Coles, Bloomsbury Publishing Plc, London Written by two extremely experienced ocean voyagers, High Latitude Sailing provides exactly what its title claims: techniques, ideas, and strategies for self-sufficient sailing in cold waters. But it is also an inspirational book. Before you’ve even begun reading the text, Bob Shepton’s gorgeous photographs will have you running to the chart table to plan your own voyage to the superb wildernesses of the far north and south.  A renowned sailor and mountaineer,…