The regatta comprises a number of end of season dinghy class championships including a 'Worlds' event for the local historic Rankin class.
After four races sailed in the 29er Southerns, locals Harry Twomey and Harry Durcan are the clear leaders with three race wins.
Swords Sailing Club's Patrick Wyatt and Patrick BillingtonIrish lead the Multihull National Championships fleet of ten boats.
Eoghan Duffy and Cathal Langan of Lough Ree Yacht Club continue their domination of the Mirror class this season and lead the 12-boat fleet racing for Southern Championship honours at Crosshaven.
Full results after day one in all classes here.
See photo gallery by Bob Bateman below.