Most functions available to the tower controller and no radar rating required as it is usually a monitoring function only (I know 'advanced use of ATM' etc.). Radar rating is necessary for radar position only.
Thanks, by monitoring, would I be right in saying that if an aircraft departed and turned right instead of left on departure and the ATCO picked this up on an ATM, then they could advise the aircraft of this as they are simply 'monitoring' the aircraft's position and advising of the error, rather than 'positioning', which would involve passing a heading based on the ATM which would require a radar rating??