The Southport Seaway is closed until late Sunday afternoon for the XCAT World Series powerboat race. The exclusion zone will prevent recreational and most commercial boats from travelling through the Seaway, it will also prevent surfers from paddling across to South Stradbroke Island. It is closed today 10am-12.30pm and 1.303.30pm and Sunday 9.3011.30am and 1.30-3.30pm. A large area of ocean offshore from the Spit and south of the Seaway will also be off limits. The new 6-knot zone will extend west of the Seaway tower and south along the main eastern channel down to Sea World, until the end of the event.