Albrecht Von Hesse

At the initial screen you select speed, depth and pistol as usual. Then click the [fat] window to bring up a secondary screen (which is where you are now), where you set initial straight-run leg length (how far before the torpedo begins its ladder searching; the range on the dial is in hundreds of meters, so a setting of 25 is a straight run of 2,500 meters) the 2nd gyro angle is direction for the ladder searching (whether the torpedo turns to the left or right; it seems to be for these kinds only settable to +90 or - 90 degrees), and leg, which is how far each ladder leg runs before turning.

If you zoom out on the screen (decrease the scale) you'll see the pattern the torpedo runs, too.

Here is an example of how to use it:

Say you're abeam of your target, at a range of 3,500 meters. Set the straight run length for 40 (4,000 meters). Set the leg between 300 and 500 meters. Set the 2nd gyro angle depending if the target is passing right-to-left or left-to-right, so that the ladder pattern keeps looping in the direction your target is traveling.

It works! I sunk a large, zig-zagging cargo at 5,500 range, but it took the torpedo several ladder passes before it finally hit.