Just sending speed won't send the bearing. You need to use the sadimeter to send the bearing info (as I understand it, its what I've been doing anyhow).
So if your target is stationary, and you set speed to 0, aob to anything, and set the range to anything using the stadimeter, you can point to your target and hit the 'send range to tdc' button, and your torps should go where you want them to.
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