Alternate base available in 1st Flotilla?

[Foggy]

I'm in mid-1940's campaign and on the way back to base I get a new radio message that says that a new base is available out of one of the French ports on the Atlantic side (Lorient maybe?). So I think "Cool, I'll switch to that base when I get back to dock at Wilhelmshaven."

When I get back, I can't figure out how to switch to that base? I assumed that it meant I had access to it via the flotilla that I'm already in, or does it want me to switch to 7th Flotilla (I can't confirm by looking in the menus how to access that port)?

On that note, I'm also running GWX & SH3 Commander, does this change which ports are available by date and maybe that message shouldn't be appearing?