Manual speed input broken

[Axeman3d]

Just getting back into SH3 after a couple of years away. I stuck on Steam version, GWX of course and M.E.P v5. Wide screen mods, updated U-boat models and all the other goodies I would like simply refuse to work.

Anyway, I wanted to go full manual rather than using the weapons officer and I have hit an issue. I enter the ship type, use the stadia to get the distance and enter my best AOB guess. When it comes to speed however I'm screwed. The manual says to lock on the target ship for a minimum of 10 seconds and then click again for the speed to be entered. I'm no expert but I'm pretty sure tramp steamers can't do 68 knots.

I tried the torpedo training mission and set up on the medium cargo in that and I'm getting everything from 35 to 111 knots. I tried varying the time a bit from few seconds to 45 seconds and they're all wildly inaccurate.

Any idea what's going on? I don't want to have to resort to the WO again.