I guess that this belongs in the passage making forum: http://www.planetsolar.org/planetsolar.en.shtml A full circumnavigation--not a bunch of publicity stops--by a solar powered vessel. The boat is 30 meters long, 10 tons displacement, Tri, wave piercing and 180 sq meters of solar cells- estimated speed will average 10 knots and 48 hours energy storage capacity. So maybe in 50 years those alive will be discussing solar cells, instead of filtration of diesel fuel! Bob Austin