First thing you do: Plot the direction in which the convoy is traveling. Pick a spot along that course that you can reach before convoy arrives (you can use the plotting tool, that will also tell you how long it will take you to reach that point.
let's assume it will take you 7 hours to reach that point. The convoy is traveling at 7 knots (7 x 1.8 = 12.6 Kms.) Measure to see where the Convoy will be in 7 hours.
You want to position yourself for attack at least 20 Kilometers ahead of the convoy.
You dive and listen for it so that you can adjust your position. Go to my website where I describe the attack.
Good hunting
