[Beery]

I don't know about WaW - I never used it.

I used to do it without any contact lines or anything. You don't need them. Here's what I do. I get a hydrophone contact and I approach it until I get a visual contact. I then dive and mark the position on my world map. If the target is heading away I do an 'end around', marking his position every few minutes until I get a good cours for him. If he's coming towards me I get an approximate course and dive and position myself to get a 90 degree shot. In both cases, once I'm in position I stop and listen with hydrophones. I make small corrections to my angle of attack and get to about 1000 yards off his projected course. Then I wait and listen until he's a few degrees short of being dead ahead. Then I pop up the periscope, take a Range reading, put in the angle (which should be approaching 90), and calculate the speed. This takes 30 seconds max. Then I update the angle to his present position and fire at least two torpedoes with a 5 degree spread.