Not managing a IIA sub at all

[Roghain]

So. Running this game for two weeks now and enjoying the possibilities - well, actually, not even overseeing them, but that's another story.

Got the GWX and SH3 Commander installed. Think I'm ready for my first career.

1st flottila, assigned the U6 type IIA. First mission, patrol AN21.

Verzeihung, kommandant... AN21? The navigator scratches his ears. We be a coastal sub, herr kaloun.

Not to worry, junge - we can refuel at the end of the Kiel-channel.

Refueling... then returning to... HEY!

I sailed all the damn way to Cuxhafen, docked there (to refuel or we can't make the roundtrip) then returned 9or so I thought) to the mission. To my surprise this is suddenly mission patrol 2 (?) and orders are to patrol grid "NULL".

I must be doing something hideously wrong... how do I refuel without "abandoning" the mission?