[Fish In The Water]

Originally Posted by Wreford-Brown

What we could do is set it up by date rather than random so the effect lessens during the course of the war. That could give you a good 45 mins head start and a 350m radius through the first part of the war reducing to 10 minutes and 50m later in the war based upon broad brush Asdic changes.
May 1942 - introduction of type 144
Apr 1943 - introduction of Q attachment to type 128
Sep 1943 - introduction of Q attachment to type 147

Easy enough to do: http://www.mediafire.com/?pscwga39htop0m0

Interesting idea...

Taking a look now, thanks!