Saturday's ISORA long offshore race from Dun Laoghaire to Dun Laoghaire is expected to be 80 miles in length but with light winds forecast the expected 16-boat Dublin Bay fleet will not know the course until shortly before the 8 am start time.
Winds are forecast to be northerly and only five knots in strength presenting the race committee with a challenge to set a course off the Dublin coast.
It won't be the only light air challenge this season either with last Saturday's 50-mile racing turning inside out and allowing smaller boats to take the lead. It was a scenario that allowed ISORA debutante A Plus to take a race win in the 11-boat fleet that included ISORA champion Rockabill VI of the Royal Irish Yacht Club.