I was told.
Length divided by time.
You put the crosshair in front of the boat, once it touches the bow start counting until it reaches the stern. This gives you time.
So lets say 120 seconds.
Next you need to identify the boat in the ship book thing, lets say its 200 long.
so you have 500 / 100
Witch gives you 5
Now you times that by 2 and you get
10 so its 10 kts
Hopes that clear ish.
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