tmdgm:
From what you describe I can think of 3 possibilities:
- Are you sure the TDC is on? The GSP light must be on for it to calculate a firing solution.
- The range, speed, AoB data on the dials must be entered by pressing the right button otherwise it won't be used by the TDC.
- The speed estimates given by the crew are just that - estimates. The same goes for the target marker on the map. It is possible to enter all the data the crew provides correctly and still miss.
BTW, the torp depth is set on the slide out panel at the left of the periscope. Hope this helps.