Ok - so getting close now Mike
As an ATCer - have you any suggestions as to "what would be considered CAUTION"
What would the industry expect of the pilot (student?)??
Take off immediately and go straight ahead - therefore, effectively, ignoring the potential vortex (as ATC would have covered their backs by giving the 'caution' statement)??
Take off immediately and do an early, low level, relatively slow speed, turn into wind - over whatever built up or noise sensitive areas there are - without declaring their intentions not to follow centreline??
Ask, before entering the runway, for the early turn after departure (what if this is refused?)??
Ask, after entering the runway, for the early turn (what if refused?)??
Decline immediate take off until two minutes have elapsed - but run the risk of another jet being cleared to go in the meantime, with yet another two minute delay??
As the only thing a pilot can do about wake vortex is physically avoid it - it seems that ATC just cover their backs with the warning, and then leave the pilot to either risk destroying the aircraft on departure or getting their ears chewed for not taking the immediate take-off clearance or for making an early turn.
Suggestions from anybody - what constitutes "CAUTION"??