Thats why i was getting confused, I thought the same, but what would mean any influence, any current or perhaps waves? What else could stop a
torpedo if not some target boat? Would a smaller boat or a swimmer be able to influence its trajectory if they were at the right time/place? Somehow doubt that. Im not very familiar with war/naval technology in general, just a basic idea of the principles and their physics
I'd say currents, detritus, and imperfections in torpedo shape. It's hard to make an inert thing move in a straight line in water, much like it's hard to make a paper airplane that flies straight. A control system like this, however, can maintain a flat trajectory.
