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Originally Posted by predavolk
Thanks for the explanation, but wouldn't AoB greatly affect this calculation? Did you mean +\- 5 degrees or 50?
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No. AOB only makes a difference if it's so small that the beam of the ship starts to interfere with judging the position of the bow and stern (that is 30 degrees or less)
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2. Be at full-stop ideally (or no more than 1 kt) and try to be side-on to the vessel as much as possible - it doesn't work from straight ahead, but 90 degrees + or - 50 degrees is usually fine.
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Not necessary, although it helps if you are slow. The easiest if you are making headway is to point your bow at the target while you make the measurement - then the effect of your motion on the measurement is minimalised. And even so, with a little practice it's easy enough to account for your own speed on the measurement.