ok from the horizontal line there are 15 marks total, i line up on a tramp steamer and and count 12 so a total of 240. multiply that by 22.7 and dived that by the 2 remaining marks under that and u get a range of 2724. if u get the aob and speed right and he dosent zig on ya hes going down. there are times when u shouldnt count a mark thats just under the tip of the mast but with practice ull get the hang of it
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