well 3 feet is 1 yard and 1 yard is 90 cm - or 11 yards = 10 m
so, if i see a 300 foot ship , it's 100 yards and knock off 10%
very easy after the first few tries
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"Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill
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