Yowzas!
I finally completed the mission objectives for this EXCELLANT homemade mission, and all I can say is, if you have'nt tried it yet...you're missing out!!
The bad guys are REALLY bad and you MUST follow every received radio message (all coded with the Enigma simulator). I had an armed trawler hound me to death, but finally managed to slip away. (At this point, I was not allowed to attack)
Give it a try folks...you'll be glad you did!