The Wetsuit Outlet and Zhik International Moth 2023 World Championship, starts today, Monday 12 June.
Following the pre-event 2023 UK Nationals, the 154 entries will race in a maximum of 24 races at the Weymouth and Portland SA from Monday 12 June to Sunday 18 JUne for the World title.
There are three days of qualification racing, a layday and then two days of final racing scheduled.
Of 28 countries entered Britain has the biggest entry with 60 competitors including the defending champion Dylan Fletcher.
A strong challenge is expected from the New Zealnd entry, with Jacob Pye winning the UK Open title in the pre-event.
Other front runners in that event were Tom Burton of Australia, Joan Cardona of Spain and Jean-Baptiste Bernaz of France.
Best placed British competitors were, Eddie Bridle, David Hivey and Kyle Stoneham, with Dylan Fletcher finishing 23rd.
Conditions are expected to be sunny with wind WSW 8 to 10 knots, with a Met Office yellow rain warning in place.