If you play with contact updates on the map, you can do the following:
Mark the position of the target on the map with X and start the stop watch immediately. Wait for 3 minutes and 15 seconds (3:15). Put a new X on the ships new position.
Measure the length of the line between the two. The distance in hundreds of meters is his speed in knots. So if you measure 0.7, that corresponds to 7 knots.
It's simple and works good.
Have fun
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