I use the Fast 90 method for shooting. There are a variety of ways to determine a target's course so you can arrive at a perpendicular course, but I don't go into that. I just cheap and use the AoB from the WO and calculate the target's course using a formula.
Once that's done, I fired a torpedo under a target at nearly 10k using a TI on slow setting. I forgot to switch back to magnetic, so it passed right under the ship. Very disappointing after waiting nearly ten minutes for a hit.
Of course, at that distance, having a good range estimate is probably more important for scoring a hit. I just recycled the dated range the WO gave me and plugged that in. Not sure if you can even get an accurate distance using the mast height at 10k.
Anyway, it can definitely be done without auto TDC. But it's easiest if you're nearly perfectly perpendicular to a unaware target in calm seas.
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