US Subs were equipped with a bathothermograph which recorded water temperature. It wasn't available at the beginning of the war though (I'm pretty sure). It was added to a boat's equipment as it became available. THis is not reflected in the game though. We can't look at the graph to see how strong a layer is--the game just assumes that it's there. A hard-coded, unmoddable game aspect...
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If your target has a 30 degree AOB, the range from his base course line equals the current range divided by 2.
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