Plotting

Plotting is a method which relies on taking multiple measurements of the targets position and marking it on the map. In order to do this you need to know your own position, and have a reliable method of determining range to target. When surfaced, own ship is marked on the map, but if you are submerged you will have to keep track of your own position. Distance can be determined using the milliradian scale in the periscopes, or by using the fog. Using the UZO or one of the periscopes you can read the relative bearing of the target. Now draw a straight line from your location with a length equal to the distance to target, and course equal to the true bearing to the target. It is a good Idea to also enable the time stamp for the line, otherwise you must manually take note of the time. Repeat this process several times over the time of at least 10 minutes to get a good solution. Now by eye draw a line that best fits the observed locations, from first to last measurement. This will be a fair estimate for their course line. To find the speed, measure the traveled distance of the target in meters, and calculate the time in seconds. Using the following formula, you can derive the speed:

$$\frac{distance*1,94}{time}=speed$$