Here in the UK I guess F3a is pretty much seen as a team sport. The caller will call the manoeuvres (obviously) but will also give information to the pilot such as position in the box etc. If they want to give advice about rudder inputs etc then why not? Although by the time you get to a competition you should really have flow it enough to not need this level of help during the flight.

The key is to practice with a regular caller, that way you get to know what each other wants such as when to call a manoeuvre, how much detail, where you need help in positioning by counting into centre etc.

Ultimately the flight is down to the pilot but having a good experienced caller makes a big difference.

As for calling for the judges - definitely not!! That is what the scribes are for.

James