[Gorshkov]

I am afraid thread linked above is a bit outdated because later patches modified TDC/periscope aiming a lot. Now in stock SH5 version 1.5 this works as follows:

1. Lock target with periscope.
2. Identify target and send this information into TDC.
3. Measure range to target using stadimeter and send this data along with actual target's bearing into TDC.
4. Wait awhile and then repeat step 3.
5. Obtain target's speed (it is measured automatically after patch 1.3 or 1.4) and enter it into TDC. In this moment Navigator will give you precise target's course estimation.
6. Use this information to adjust AOB and send it into TDC, too.
7. Enable Position Keeper.

Now your firing solution is complete!

Of course you can also obtain course and speed yourselves by plotting tactical situation on Navigation Map, using three minutes rule, nomograph, sonar or radar data. Yet method presented above is now a basic periscope/TDC targeting technique in SH4.