Manual targeting?

[PettyOfficerLarry]

Hello everybody:

After a couple of solid patrols (18 to 20000-ish tons) I´ve decided to turn on the manual targeting system and to set up the attacks I´ve been using the "Fast Subs" mod, but it just doesn't feel right seeing my little Type IIa going 24 knots and out running destroyers.

Are there any guides on preparing attacks with the default speeds and catching up contacts from behind?

(Sorry if this was already asked, I´ve looked for almost an hour now and I can´t find the thread)