First of all: If you don't want to get new missions you should stop sending messages to COMSUBPAC.
Then I assume that you're not using the latest patch, because a slanted anchor will show you your homebase. Prior to patch 1.4 every allied port has the same blue anchor.
So now there are several ways to find out which port is your new homeport:
1. Try to dock at other friendly ports
2. Check the CareerTrack.upc file in your SH4 savegame folder
3. Download Billkos Damage Control Analyzer which will not only show your damage but your rank, medals and homeport.
The mode can be found here:
http://www.subsim.com/radioroom/showthread.php?t=121353
I hope I was able to help you.