Target Speed and Direction finding

[Yahoshua]

I think I've found a way to determine target speed and direction from long-distance via sonar contacts, but I haven't tested this method extensively:

Step One: When you get a contact via sonar, mark the direction it is in bearing to your U-boat on the nav map (one on the uboat itself and one to mark the bearing).

You'll have to compensate for direction to true N. by 360 - bearing to contact (add 360 if a neg. number) = protracter dilineation.

Then use your compass to make a circle out to 20 km (long distance) 10 km (medium range) and closer than that you should be able to spit on it.

Start the stopwatch.

Step Two: Draw a protracter line through the two marks you put down on the map out to the circle and put another mark there. One going the direction of the U-boat, and the other connecting the marks.

Stop the clock at 3:15 sec.

Repeat steps 1 and 2 to get the next set of markings. Use the Nomograph mod (I think wazoo made it? Not sure on this) to get the speed of your target, and draw a line using the ruler to get the approximate direction of the target.

Then you can set a course for interception.