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Rule of Thumb: Distances and Angles on the Horizon

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Rule of thumb channel markers

There are plenty of times on boats when a lookout has to relay a sighting on the horizon to someone else on board. This can be tricky if the second person can’t focus right where the lookout is pointing. (Picture a lookout on an aircraft carrier whistling the admiral over: “Yessir, just put your chin on my shoulder and follow my finger. See that leeeeetle dark speck over there under the cloud that looks sort of like a dog under some broccoli?”)  more...
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