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Thread: Submarine Aircraft Detection
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Old 10th Oct 2016, 16:29
  #32 (permalink)  
PDR1
 
Join Date: Nov 2015
Location: Mordor
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Depth in a submarine is measured from the lowest point of the keel, because it's actually quite important to know if they are seeming at a depth where the keel would be lower than the rocks ahead on a chart!

PDR
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