[brandtryan]

FYI: from Blair's "Hitler's U-Boat War" pp. 43

"In submerged daylight attacks the captain, who had sole access to the attack periscope, conducted the approach, assisted by the first watch officer at a plotting board, then aimed and fired the torpedoes. The night surface attack, the captain conducted the approach at the plotting board in the control room, but he did not fire the torpedoes. That task was delegated to the first watch officer on the bridge, using the high-power Zeiss binoculars mounted on a gyro-scope compass repeater. It was a more efficient system, but not many captains willingly delegated the torpedo firing to the first watch officers. No other navy adopted this technique."