A warm welcome ‘exce’ to the Subsim family.
You will always find someone here to help you.
Link to my SH5 – SH4 posts:
Step By Step Tutorials & How To Do It
Also Included Are Some Useful Download Links
http://www.subsim.com/radioroom/showthread.php?t=211804
You can use TDW’Generic File Patcher with STEAM see my Tutorial Post #125
Sounds like you are playing the stock game.
Using an interface allows you to end your patrol so you do not have to go in to the bunker.