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Min Bearing = 0 is the bow
Max Bearing = 135 is 135 degrees to port *or* 135 degrees to starboard. Leaving the AI with a 90 degree dead zone centered on the stern (+/- 45 degrees from the stern.) You see this as an arc of dotted lines in the stock game when you click on the warship's icon.
Min elevation = 180 is straight down
Max elevation = 70 is -20 degrees from level (the horizon is 90 degrees)
Now you have created a 3 dimensional pattern that extends downward from -20 degrees below the horizon forward and side-to-side +/- 135 degrees, terminating at a depth of 235 meters. If you are anywhere within this pattern, they can hear you - if we disregard your lack of noise (hopefully) and poor water conditions.
You can also see why, when an escort is searching for you passively, a periscope depth evasion tactic can work.
Bob Chase
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