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Originally Posted by Bilgerat
no i do it totaly with the marks on the left. for instance if i set the horizontal on the waterline as if you were going to use the stadimeter. but then i line the mast up with the marks on the left then count down from the top. i count each mark as 20, so if its 10 marks then 20 x the mast heigth divided by the the marks up from the horizontal line gives the range. ive dead centered ship up to 7200 yards with this. i estimate speed with the hydrophones and seem to be lucky with aob. this keeps me from having to plot multiple times and is very useful against fast ships.
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I must be missing something so simple because I'm getting innaccurate results with this method.
For example, I spot a medium cargo with a mast height of 23.2m. At 10x magnification I count 5 ticks from the water line to the highest mast and since each mark counts as 20: 5 x 20 = 100. Then with the mast height we have 100 x 23.2 = 2320m Take 2320 and divide by number of tick marks, 5 in this case, and we get 464m but we know the target is about 1700m away.