Found a much smaller garbage patch in the SW Caribbean recently. We were about 100 miles from the western end of the San Blas Islands in Panama and ran into a large region of sargasso weed and plastic. Took us several hours to cross it. Apparently the currents from the east swirl here and plastic comes from all over the Caribbean until it finally is carried west along the coast of Colombia and Panama. Nasty looking to be sure.
Heading back to Lake Ontario for this summer. Relatively few stops along the way from Grenada. Martinique, Guadeloupe, St. Martin (must have something to do with the French food), then Bermuda, New England and up the Hudson/Erie Canal. We were going to go via Newfoundland and Labrador but June remembered that one of the kids is getting married this summer - details, details!