Around 1000 Yards is "close enough." Closer is better up to about 600 yards.
Using the Mark 14 Torpedoes on slow speed we theoretically need to be within 9000 yards as well but even the best skippers couldn't hit much outside 7000 yards. Luckily in this exercise it's night time which reduces that visibility. Spotting distance may be as much as 9000 yards on a clear day. Adjust our speed if necessary to get us on the line and "close enough" before they spot us. Be aware, as we execute this course, of where they are. This will get us there and point us in the right direction. We should plot a direct course to the nearest spot on the line with several other points along that 90 degree line. The second leg should be at a 90 degree angle to the first and be close enough for us to reach it and get submerged before they notice us. The first leg should start at their location and come up their course toward us. Use the protractor tool to set up a 90 degree intercept course. Our immediate goal is to put ourselves on a 90 degree intercept course before they spot us and then submerge to wait for them. In this case 53.5 deg NNE Now extend the line out past where it would pass our sub. You can read the course in degrees off that line. Next use the straight line tool (with the protractor open) to project the ship's course. Since there are two we can be pretty sure that they're on the same course and speed and we'd be well advised to wait for the 2nd one as it's most likely the fatter target and better armed. Generally, if one of the ships was armed it would take up the rear as a sort of mother hen. It was protection (of a sort) in that if a sub were to target one, the other had a better chance to get away while the sub was dealing with the first.
Notice how there's a second ship following the first? It was common in war-time for ships to travel together whenever possible, even when not in a convoy.
In this example the distance is 700 yards meaning that the target ship is traveling at 7 Knots. Use the Compass Tool to draw a circle starting at Mark 1 and ending at the bow's new position Mark 2 in fact speed it up (a few times) Allow exactly three minutes to pass, then pause it again. Using the pencil place a mark at the bow of the target ship. You may need to unpause the game to do this (num pad +) but then repause (Backspace). Bring up the chronometer (stopwatch) - It's generally the C key.
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