Hi vincentz
The most popular and probably the simplist way if you are using map contacts is to use the 3 minutes and 15 second method.
With the game paused and the ship diagram on the map opened you make a X mark on the bow.
Start the stopwatch and un-pause the game.
When the stopwatch reaches 3 minutes and 15 seconds pause the game and place another X on the bow.
Measure the distance between the 2 X's.
600 metres = 6 knots
1300 metres = 13 knots and so on.
Peter
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