It could be that the particular ship you targeted had a wrong mastheight on the recognition manual. But most common would be not having the baseline on the waterline, or judging the height on a visually clipped mast. If the target is to far away the mast may be too thin to be represented by a pixel and therefore not shown. In actuallity the mast may be taller than what you see. The only solution is to guestimate the height of the funnel or other part and use that as stadimeter reference height.
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