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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