First - get close (to where you think the targets will be heading).
Estimate their course, speed and range at a set point from you - I normally get a shot lined up for a bow angle of 45 degrees - and then one from 15 degrees.
So by the time the target steams into view you've already got your shot lined up. Check the target again with the jadgchrono to estimate speed again, and use the "Range to target" button to get a good idea of the targets range - plot it - and then do it again 3minutes 15 seconds later - and make a second plot - join the lines to get their course. Their speed will be the distance travelled in that time. It should match up to your Jagdchrono calculation.
Make sure you are close - set torpedo depths and detonators. If its daytime use the Electric wakeless torps. If its a destroyer get close and use fast speed torps.
Once everything is set up you just wait until the target crosses the crosshairs of your periscope at the angle you set up and fire!
If firing at a convoy - fire at the furthest target away first - ideally with a faster torpedo - then go back to closer targets with slower torpedoes. You want them to both hit as close together as possible so they don't have chance to be alerted and evade your fish.
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