all i do is close to within a 1000m line myself up to 90 degrees (side ways on obviously) and stick a load of men in my torp room till the bar is full. go to periscope view and use the i.d manual find the correct ship and on the picture of the ship little black boxes appear move your cursor over these and target whichever compartment you want. you wont see these compartments appear unless the torp bar is full, you must be within 1000m and be more or less 90 degrees from the target ship
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