Silent Hunter 4 how to calculate speed on german u boot?

[Przemek115]

Do you know how to calculate speed of the ship on german u boot?

Is there is a mod for this?

[dejectedarr]

I'm still using the 3 minute plot on the map to get the speed of the vessel.

[merc4ulfate]

I estimate by sight. Most Task Forces speed along at 15 to 20 knots and most merchants at 7-8.