Not exactly sure what the problem is, are you having trouble with auto-tdc being auto.. or manual-tdc being manual?
If you are using auto-tdc (as in you have unchecked the "use manual tdc" button in the options panel) you simply have to place the periscope vertical crosshair onto a ship and it will automate do the solution for you. You will see a small arrow icon under the ship and its color will denote the quailty of the solution (red=bad, green=good). To "lock" a target click the "L" key by default, this simply locks the periscope onto the ships middle so it follows it without you having to turn the periscope. This works in manual or auto tdc.
There is no way to toggle between auto/manual during a game. If your on auto it will automatically calculate a solution for whatever ship is currently under the periscope. If its manual you have to do it all by hand. Lock periscope is just that. Locks periscope view on current target.
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