I don't have the time right now, but the way to find them faster is to use a 'Search" in a text editor, and look for a generic Type=4 (DD) (whatever is specific for the problem ship) from the particular country. It could be in any of the files. Lurker, Ducimus and others over the years, all used "automatic" RGG building and zig-zag routing of those groups, and sometimes that routing failed them. They would have to get in real close on each individual group and watch them as the 'simulator' in the ME 'played' their files. It is entirely too difficult to do that with this game, which is another reason we're still finding issues in the base Stock game...
Anyway, what happens is the escorts of the group are doing their 'escort' duties and escorting the groups. Now, remember, the game doesn't draw anything until it has to, so the group is just traveling along in the digital world, invisible, if you will. It doesn't worry about spacing, land masses or collisions until it comes time to render. Along comes your submarine, and the game has to start drawing things. If you've ever traveled very far in the game with the external camera, it's easier to visualize what transpires, because if you ever turn around and look behind you, or go far enough ahead, you'll see that the land masses are not drawn 'complete', but only the front faces... Until your sub gets closer. So here's this group, only in the computer memory, and as you get closer, the game draws more and more of it, and some of the land features on the facing side... The outside escort decides, with the help of computer logic, to do an outside sixes knuckle check, thereby carrying it over 2000m further away from the group, and right into the middle of the landmass face that just got drawn... Collision detection takes over, and land rock beats ship every time...
That is the trouble with Random Generated Groups, especially if you're dealing with three or more columns of ships. It's difficult to visualize what they'll look like once they render in the game. Let's say they are set to be 700m apart. Three columns would be over 1400m wide with just the group. Add another 1400 for the escorts on either side, and then another 1400m minimum for those escorts to do their twisty-twirly knuckles for ASW, and next thing you know, that group is now over 4800m across. Then you make them come into a harbor, near land and ~turn~... It's a wonder you only see two that have run aground like that...
