Now auto targeting doesn't mean you'll always hit the target. As a matter of fact I seem to collect more goose eggs with auto targeting than I do with manual targeting.
In general, you'll have better luck with
- slower targets, high speed makes little errors into big ones
- keep your course as close to right angles to the target course as possible
- targets that have not detected you. Maneuvers after you shoot mean misses
Now with auto targeting you don't have to identify, you don't have to send the bearing, you don't have to figure their speed, lock the target or anything. Just point the periscope so that part of the target is in the crosshairs and you're supposed to be good to go. Fire!