Ship's route
 

I created a simple mission, naval attack with a Ju-88. I set 6 tankers, 1 km from each other, same route same speed. When I attack, some of them change route. Maybe it's a defensive manoeuvre, but sometimes they crash with each other! Is there any way to make them a bit smarter?

Ships are on veteran skill level by default and will try defensive maneuvers when attack. Put them on rookie and they will at least follow a straight line.