One way they did it in WWII was to measure the distance the target travelled in a minute. Mark the target's position on your chart and start a stopwatch. You can use any stopwatch or wristwatch that has a second hand. Mark the target's position exactly one minute after you start timing. Measure the distance travelled in one minute and you know what the speed is. I use a table of speed calculated in advance. For instance, 216 meters in one minuted = seven knots. If you cannot mark the target's position on the game chart due to difficulty settings, make your own chart. Put a point in the middle of a piece of paper marking the position of your boat. Using a 360 degree protractor find the relative bearing of the target and using whatever scale is appropriate for the situation, such as one inch + 1,000 meters, mark the position of the target relative to your boat. After one, two or three minutes, mark the target's new position on the chart and measure the distance travelled and calculate the speed. If your boat is submerged and you are moving at a low speed, and doing the calculations based on one minute of travel, your boat probably does not travel far enough to worry about. If you are doing the calculation over a period of several minutes, you should mark the new position of your boat before you plot the new position of the target. It is helpful to have another player handle the "Manual plot," and actually maked it a two player game, which adds a lot to the fun. I hope this is helpful to you. Joe S
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