Yes, two things to be aware of:
Always check where your small blue port symbol is. That's where you are supposed to go home. I also returned to Kiel and then the next mission began out of Wilhelmshaven. I guess Doenitz moved my sub while I was in the bar.
And it may be necessary to toggle the interface with Shift Z to get the anchor icon to appear.
the anchor never appeared until I was completely in the pen
I hit Shift Z and it appeared.
All this info can be easily found in the
TIPS and FAQ sticky thread above.
cheers
Neal