Bob Langley and Malcolm McKeag visit the west country to set the scene as nearly 100 sailing boats set off over the 2,000 demanding miles that will decide the winner of the City of Plymouth's Round Britain and Ireland Yacht Race.
Debbie Rix is at Feltham to make waves at the world's most advanced marine research establishment and there is explosive powerboat action from the London Docks.
Directors CHRIS WRIGHT and MARK KERSHAW
Producer TONY RAYNER BBC Pebble Mill