Interesting. I knew that was how puffy worked, I was not aware field tracer ack worked in the same way.
With puffy, from what I recall it's to do with speed and also how many Gs you're pulling. More speed and more Gs, bigger box, less likely. That's why a lot of the time people will be cruising high and fast on autolevel and suddenly take a ride to the tower due to a CV ack to the forehead.
Now I want to go jump in front of base ack and see what happens. If it's autocalculated, what if you steer into a tracer that's going to miss you?
Wiley.