Point and shoot can be a bit tricky:
a, turn off Position Keeper
b, set target speed to zero (and send it to the TDC), this makes the targets' course irrelevant
c, set the range as high as possible (don't turn the dial, use the normal gear, just bring the two images really close to each other and you will get a large range, everything about 3000m is fine)
d, look into the direction you want to fire and click 'send range to TDC' (which also sends the direction)
e, fire away
As louist said, the trick is the difference between the point from which you gather your data (tower) and the point where the torpedo starts to turn (several meters away from the tube). Because of this, the torpedo angle has to be a bit larger than the one you measured, it is set this way automatically and there's nothing you can do about it. You can, however, minimize the effect:
a, The longer the range, the smaller the correction the TDC makes (-> step c)
b, The smaller the angle, the smaller the correction, you can ignore the range if you shoot at 0 or 180 degrees.
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