Hi Steve
You need to do and complete the first mission Baltic Operation so your base changes from Memel to Kiel.
Start your game in Kiel without requesting a mission.
At some point quite early in your game your base will change from Kiel to Wilhelmshaven.
You will get a radio message informing you of this.
You should see the base icon has also moved.
Once you have this new base you can then play the game the way you want to using Wilhelmshaven each time to end your patrols, dock, rearm, and start a new mission from the officer without ever requesting it.
Missions will continue to appear on your navigation map in this your First Campaign > Total Germany.
You will continue ignoring these missions.
At midnight on April 12th 1940 the Total Germany Campaign will disappear from the navigation map leaving you with no further Campaigns.
Code:
What about enemy units? Do they stay stuck in 1939?
You can roam as far as you have enough fuel to get back to Wilhelmshaven.
Whether you are in the North Sea or the Atlantic there will always be targets out there somewhere.
Peter