Another hint for determining AoB that I use is this: the sine of 30 degrees is 0.5, so if you compare the view in the periscope to the side view in the recognition manual, a target at 30 degrees AoB will look half as long as it does at 90 degrees. The same way, a target at 45 degrees looks 70% as long, and at 60 degrees, about 85%.
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