It's easy to see how they change speed if you have contacts on, even without. I can get speed with 3 minute rule using radar or scope visuals. The easiest way to test it is just to cut auto target on and you get a constant speed through the scope.
It's always been obvious a group will slow down greatly once you're found out, with cams on you can see fast to medium to slow ratings. This is much different than the small zig legs they make when they go into evasion mode, not to be confused with possible zig or speed changes from waypoint settings.
The main group will hold the set speed given to that group, they only slow and go into evasion mode when they know your sub is there. The main group, not the escorts will hold that set speed. If a ship is set to act as an escort, it can roam around the group on escort duty changing speed.
If you want to test it, just use auto target, and watch the speed changes during small the small evasion zigs, they never average over 2kts, usually 1kt.
Take my recent attack on the Center Force. I stayed out of range, speed was 22 knots. I needed to do a end around, but group was going too fast, so I simply slipped into it's radar range to get found out. The group slowed down to 14kts and started zigging. I sped away and got out of radar range, DD's came, but I was long gone before they reached where radar had me. Now it was easy to do a end around, I had the group slower than I. Historically the group would have increased speed and left me further behind. I find this a terrible flaw, because in the end I can make most groups slow down and pull off my attack.
Sometimes once a group clears you, I assume contact has been lost over a set time limit, they increase back up to the set waypoint speed.
It's possible because the zig legs are so short, that somehow limits overall speed. The bigger issue for me is the short zig legs. They're so short, it's more like the ship is just helming left and right. Zigs are supposed to leave you way off track, but that just doesn't happen in the game. If you could increase the zig leg to even 1000 yards, that would help greatly.
To me this is the biggest cheat in the game, get found out to slow a group down, I know many that do it.
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