[Wulfmann]

When Jason went to 900 for spacing I did also for my own custom RND file.
However, what I found was this moved the escorts too far away and I could sneak in to a convoy, keep my periscope low sink ships with 5 torpedoes, go off silent, reload and continue shooting without the escorts coming in after me. If you like that; 900 is the way to go.
I did not think that was very RUBish.
Actual convoys kept about 400 meters (As I read in two sources). Problem with 400 is when a convoy reaches a waypoint they bunch up and it takes hours for them to sort it out, very unRUBish as well.
So, I went to 500 or 600 (variation) which has worked very well.
I ran my first patrol with a highly experienced crew, sunk one ship and was pounced by three escorts and sunk. I was pleased and p**ssed at the same time.
I now must remain on silent and can only fire the 5 fish or will be detected too quickly (even them I have been detected without firing) and the escorts being closer makes it much more difficult.
I prefer it more on the edge as I have also made all my escorts 3 or 4 crew ratings (veteran or elite)
I have done more than 30 patrols this way and it is much harder which is more exciting, IMO
It is very easy to change your distances in any RND.mis file. The convoys are RND groups 61-118 and at the beginning of each convoy you can see the spacing which you simply change if you like. Make a back up copy, change the new one and try it. For the RND file it is one of the easier changes you can make.

Wulfmann