Ships in a group also have a distance set between them. Sometimes, if the distance is not large enough between certain ships, their "collision avoidance" will kick in. The bigger the ship, the sooner this happens. You will then see the ships wander all over the place, as they attempt to "avoid" each other. Another thing we just found in the SH4 Fall of the Rising Sun Ultimate Edition is the Group MaxSpeed versus the speed that some of the waypoints for a ship / convoy route are set to. Anything set to above the Group's MaxSpeed can cause all sorts of issues with convoy keeping. The slowest ship in the group determines the Group's MaxSpeed.
