Data on the risks?
Try (1) Jimmy Cornell who writes on (and does) worlds cruising and organizes tras-oceanic rallies and (2) folks involved in the organization of round the world races (e.g. BOC, Vendee Globe) and (3) Chay Blyth or his organization who does the Global Challange where you pay to race around the world on matched sailboats with professional captains. All these folks are (A) in a position to know if the data exists and (B) to put you in touch with those who do know.
I am sure that all these folks have to deal with insurance issues and could put you in touch with the underwriters who have the data.