Until HQ tells you to return to port, the mission is always unfinished, so no matter where you go, you have the same mission to complete and you cannot end the mission (you only get refits at port.) Until your mission is fulfilled, you can go anyhwere you want, sink stuff and use up all your torps, but you still won't get recalled to port until all the mission objectives are fulfilled.
I discovered this last night after having expended all my torps I called in with a status report several times as I was patrolling my assigned area. Finally a convoy entered my area close enough for me to intercept it without leaving the area and I got close enough to send a contact report and 15 minutes later, I got the message to leave the contact for "other assets" and return to my assigned port.
-Pv-
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