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Originally Posted by Soundman
Could you explain the differences between the inner dial compared to the outer dial a little more clearly for me, as well as what you mean by computed bearing.
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Forget the outer ring on the lower left hand dial, it doesn't matter. It is just "True Bearing", which is the target bearing oriented due north. Forget it. What you want is Relative Bearing.
First understand this: What the TDC does is it TRACKS a "virtual" ship based on the data you entered and updates gyro angles for the torpedoes accordingly, and in real time, while also taking own ship movements into account.
Now, what I say is that after your initial data gathering (take range, judge AOB, guestimate speed, and press the TDC button) you have to compare the sighted relative target bearing with the TDC-computed relative target bearing.
Sighted relative target bearing: This is the ACTUAL bearing you see in your scope / TBT when looking at the target.
Computed relative target bearing: This is the continously computed bearing of where the TDC "thinks" the target is. You see it on the lower left hand dial, at the 12 oc position, in the inner ring. Notice there is also this mark above the dial. When you move your mouse cursor over it, you will also get a digital readout saying "Relative Bearing xxx". Or "Relative Target Bearing xxx".
- If the bearing you see through your scope while following the target "outruns" the bearing the TDC "thinks" the target is at, it means that the TDC has too slow a speed setting for the target, so you increase target speed in the TDC. Once done that, transmit bearing again. (only possible by taking a range measurement as of now, which was the initial point of this thread).
- If the bearing you see through your scope while following the target "laggs behind" the bearing the TDC "thinks" the target is at, it means the TDC has a too high speed setting for the target, so you decrease target speed in the TDC. Once done that, transmit bearing again.
What you want to achieve is have those two bearings stay identical to each other all the time, because this means the TDC "knows" the target position and thus the proper gyro angle setting for the torpedo.