I was taught to use standard measurements such as a "Gnat's Whisker," and use the end of your thumb to represent one and a half inches. Another "Rule of Thumb" that always guaranteed precise results was "That much plus a bit." This one was useful when setting moorings.
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"You do not ask a tame seagull why it needs to disappear from time to time towards the open sea. It goes. That's all." Bernard Moitessier.
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