[joegrundman]

i will spell out the steps of the kind of approach and attack you are attempting

1. plot target course, calculate speed: e.g. target course 100, speed 9kts, showing it's starboard bow to you

2. maneuver into attack position

3. Adopt an attack course that is 90 to target track. target is 100, showing starboard to you, so your attack course is 010. Now when the target passes in front of you it will show AOB of starboard 90. Say "yes" if you understand this point.

4. Set periscope to bearing 000

5. turn tdc to manual

6. set AOB to starboard 90

7. set speed to 9

8. set range to what you estimate it to be when you fire (but as it's a straight ahead shot, range accuracy is not important)

9. set tdc to auto

10. Now point scope at the target. the aob on the dial should be (090 minus degrees of bearing) to target. if the bearing to target is, say 300 (-60), the aob dial on the tdc should show starboard 30 (90-60). Say "yes" if you check that this is so, and understand why. NB you don't even have to point at the target to test this, just set the scope to any deflection and the aob dial should show an equivalent deflection.

11. Now on the scope screen there is a 3 digit number somewhere that changes as your scope bearing changes. it should show 000 round about when the scope is showing bearing 350. this is the torpedo gyro angle indicator

12. track the target with the scope. When the gyro angle indicator shows 000, click fire for a perfect straight shot.

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to be sure of whether or not you are hitting regardless of duds, set depth to shallow, torps to impact only, and put event camera on