That last post pretty much gets the speed part out of the way.Now with map updates off it is going to be far more difficult to get accurate plots so you can get his mean course.I think the best thing to do,at least for me at the moment,is not to forget the four main compass points,to get a quick bearing on his direction.So,if I was going west,and I spot a ship going left to right roughly,I would swing the boat round to the north,this is logical.At this point I need accurate observations on his true direction,which is quite difficult.If it looks like his bow is facing slightly away from me I would likewise turn my boat say,10deg towards him,and repeat until his beam is about level with mine.Does this sound a good method,for getting his mean course that is?
Next,if I have his course,I could then extend his course on the map in front of him and do the same from my U-Boat,and then measure the distance between both lines,this then would be a good value for range?
I get the feeling that playing without map updates on forces the player to use his own judgement more,using visual cues all around him,which as a matter of fact does sound far more realistic,as the real captains would have had a lot of trial and error to contend with,not to mention the possibility of visual distortions.I think what i'm trying to say is,it would develop a keen sense of spatial awareness.
(getting quite excited at the possibility of improving my already decent skills at the game)