Wills and Kate will be put to work on former America's Cup matchracing yachts in Auckland next week.
A spokesman for the event confirms the Duke and Duchess of Cambridge will be "actively involved" on the boats just offshore in the Waitemata Harbour.
The course will be just metres from the waterside bars and restaurants in the Silo Park precinct.
Rounding out the crews will be America's Cup sailors, six teenage sailors from the Royal New Zealand Squadron youth programme and another six up-and-coming sailors hand-picked from Auckland yacht clubs.
Emirates Team New Zealand chief operating officer Kevin Shoebridge said 10 team members, including boss Grant Dalton and skipper Dean Barker, will be on board when Prince William and Kate Middleton take to the water.