Draft and Joea have two excellent methods. I'm more of a guesstimater like Draft. I use about half of the total speed the vessel can do but I get in close and dirty so if I'm off by a kt or two, it does not matter. Even with this said, I find it harder to guess in SH4 than SH3. To me, 7kts was about the most correct figure for every vessel in SH3. SH4, there is a wide range of speeds for each encounter and each vessel. Much more of a challenge.
At any rate, the chronometer is on top of the bug list that needs to be corrected. For now, guess or use Joea method mentioned and, if you get a message the convoy is doing X kts...usually they are so set you speed for what the message stated.
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“You're painfully alive in a drugged and dying culture.”
― Richard Yates, Revolutionary Road
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