depends on the weather if your playing historal or not but weather,speed,moon light plays into it at night with low speed cloudy i have had escorts come within 100 meters of me early war and not spot me tracking the convoy i keep the top of the mast in sight keep a study eye on it cause it might come toward you or away operating the scope keep your speed down and the scope just high enough that waves washes over it every few seconds never stop or go silent unless need too early war if your spotted before firing you screw up,the sub not a sniper but more of a Ranger perfect for ambushes
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