I used to do it all the time with no map updates and 100% manual targeting completely at the periscope - no map reference at all. If you can judge the course of your target within a reasonable range of accuracy it's very easy to line up a shot. Get perpendicular to your estimate of the target's course. After that, hydrophones and periscope are all you should need. You can always tell when the ship is at 90 degrees to your boat. Fire at that point and it's hard to miss.
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"More mysterious. Yeah.
I'll just try to think, 'Where the hell's the whiskey?'"
- Bob Harris, Lost in Translation.
"Anyrooad up, ah'll si thi"
- Missen.
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