Well the other person was usually the XO, and what he read was the bearing and or range, as the skipper moved the scope and moved the stadometer for the target for range info. As most of you know the skipper did not have a bearing or range indicator on his display like we do ours. It was the XO that read this info at the skipper's "mark". You recall, the skipper calls out "Bearing........mark" XO, "three three one." at that someone at the plotting table would draw a line out on the map from the sub's posistion, out, also the TDC officer would input this into the TDC. The skipper "range.....mark" WO, "one, one, thousand", this info would result in the plotting party putting a mark 11000, yards out on the drawn line, and the TDC officer putting said info into the tdc. This would be finnished off by the skipper guestimating the AOB or angle. On the back of the scope is the range indicator, very much like the one we have in game, and at the top of the scope a pointer and bearing indicator. Without the XO or other person the skipper could not carry out the attack.
Auto TDC does this for us, wheras manual is very very clumsy when it come to sending info to the TDC.
German subs however, quite a bit different. The bearing info was available to the commander, but he had to look away from his scope to look up and see the bearing pointer, call that number out, and return to his view. German scopes after the type VIIA were powered units (the attack ones), The range was also viewable by the commander as a mechanical/digital display adjacent to him. The Bearing info went directly into their version of TDC, so all that they needed to get from the commander was range, AOB, and speed, the last two being a guestimate until the last few moments before the shot.
All of this is done by auto TDC in the game. If it wasn't for the precision, it would be pretty darned realistic.
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