[Jaguar]

Originally Posted by Alky

I'm just looking for a simple way to acquire a target and draw from the hip and fire. Later when I feel more at ease with the sim, I'll turn the realism knob up more as I go

Then just put the target ship in your periscope/UZO and do not lock. Keep the ship in your sights and fire.
It's clearly seen in the mini-map, when you have the target centered in periscope/UZO, torpedo trajectory on the mini-map automatically go to an intercept course.