Competitors were tested today when moderate winds suddenly developed to 18 knots plus with gusts reaching 28 knots.

Australia's 470 Olympic medallists, Mat Belcher and Will Ryan, finished the Medal Race second to claim their fourth World Cup title.

The Italians were only headed once in the Championship, while the only Australian, Kevin Nixon (AUS) finished 18th overall and sixth in Corinthian Division.

Shifty 5-10 knot breezes were the order of the day on Port Phillip and changed up the leaderboard in both divisions.

Medals were decided in the Nacra 17 and Women’s and Men's RS:X windsurfer, the remaining classes will be raced for Saturday local time.

In a spirited battle in Class B, Savannah scored a hat-trick, beating Ganesha once again.

American Monsoon now leads, while the only Aussies, Kevin Nixon and his family on Accru, are 19th overall and sixth in the Corinthian fleet.

No wind, then finally extremely soft and shifty conditions, but nothing fazed competitors who enjoyed the short course they sailed on Day 1.

Following two bullets, Mat Belcher and Will Ryan (AUS) advanced to the top of the Men's 470 leaderboard.

The spectacle offered by these giants did not go unnoticed, with many tourists stopping to admire them from the shore and from sailing boats.

Helmed by Andrea Racchelli, the Italians on Altea take control of the standings by six points after six races and one drop.

The catamaran had a broken mast, one working engine and was low on fuel. The two men on board had survived only on rice and fish from the ocean for two weeks.

American boat Full Throttle continues to lead the overall championship.

Australia's Mat Belcher and Will Ryan are in third in the 470, seven points from the lead.

Over the past few years, at least three young Britons have died working on board.