starter needs help

[wanishedwiz]

hello

i just bought sh5 and i would like to ask you for help.
i did turotial and second mision, but i took me along time, because of stearing.
i am ploting courses on map, and when i attack something i turn my sub toward the target with ins button, what i would like to ask is how to return back on ploted course, because its anoying to plot all the patrol points once again i would reather return to previous ploted way. is there any shortkey or what must i click or do. also last time i tried to attack destroyer for a joke, i had tdc on, i find the shape of boat, i mesured the distance, but tdc wouldnt conculate speed, and how should i use angle ? must i use angle from which i see the boat or what is the point of angle ? one more question, when i have all the tdc resoult and tdc turned on, should i shot torpedos infront of destroyr or will tdc automaticly shot them before destroyer. last time i spended all of my torpedos because destroyer was moveing to fast and all my torpedoes mist for tiny thing but i was shoting blind.
tnx for help