Manual targeting with WO assistance

[Captain Nemo]

I have started a new career following the demise of my previous Kaleun and decided to crank up the realism a bit by using manual targeting with weapons officer assistance. I am still in August 1939 and have done a few dummy runs on merchants using the WO to identify the target and plot a solution for an attack. As I am new to this I am unsure how the TDC handles this. For example, if I spot a target closing at a range of 4,000 metres I lock the scope on it and ask the WO to identify it and plot a solution. Assuming my AOB is 90 degrees and the scope remains locked on to the target as it approaches and it does not change course, do I need to ask my WO to periodically update his solution or is the data automatically updated as the target approaches by the movement of the scope or UZO right up until I fire my torpedoes?

Also, if I wish to aim at a different part of the ship I am attacking, can I just unlock the scope aim and fire or do I need to get a new solution from my WO?

Your views appreciated.

Nemo