Hi Steve
Basically it is only the first Baltic Operation that you needed to worry about as this is an OHII add on to the stock game.
That is why you have to be at sea before BCW appears and then you can dock.
Once you start with BCW the other missions will continue to appear and drop off as per their start and finish dates.
Sometimes you will have 3 missions showing on the navigation map at different times.
You will always see at least 1 mission in the Total Germany Campaign until SWA finishes at midnight on June 1st 1940.
Post #64 Open Horizons II > Campaign Dates > Bases > U-Boats
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So as long as I'm at sea on 01/12/39 that mission will end correctly, correct?
It will end whether you are at sea or docked.
It does not matter.
If you request this mission which you can as many times as you want as long as it is still showing you will continue to receive patrol objectives.
This is the same for any other objective except the specific one like BTF where you need to sink 1 capital ship.
Peter