You can also do things in reverse:
1. Send a range/bearing to the TDC.
2. Wait awhile
3. Send another range/bearing to the TDC.
4. Click the stopwatch to get the esitmated speed/course.
5. Adjust the AOB entry dial until the target dial's course matches the estimate.
6. Note which AOB that results in, and match it visually against the ship.
7. If the AOB looks correct to you, the speed should be correct as well.
8. Send the speed, and turn on the PK.
9. Then formulate your approach using the target and ownship dials. If you want to parallel the target, look at the course his nose is on. and see which persicope bearing that is for you. If you want to turn in to a 90 degree attack, you can do that easily as well.
No need for plotting on the map, or doing any math. Just use the TDC, its there for a reason.
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