Here's the easy way. It works well, it works fast.
Find a ship and ID it with the recog manual.
Use the stadimeter by clicking the word range on the datapad to set the range.
Estimate the AoB and set the value by clicking AoB on the datapad.
Click the word speed on the datapad, and you will see a small clickable stopwatch icon. Click this icon and the timer will start. This determines the target's speed based on the accuracy of the range and AoB you set. Generally an accurate speed can be obtained with about a 10 second reading. I usually take several of these, and if each gives a like result I can be sure it's relatively accurate.
Once you'e hapy with the speed, range and AoB, click the checkmark on the datpad to enter the info in the TDC. Once you get the hang of it this method takes about 30 seconds at most, less in some cases. I've been using manual TDC for quite a while and average over 90% hit rate, a good percentage of my patrols are 100%. It's fast and easy to do it this way.
The key with this method is to be completely stopped, your boat should have no way, as the movement isn't factored into the reading, and since speed is measured by the apparent angular change of the target through the optic, any movement your boat has will affect the speed reading.
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