20200406 21590600 1.0 TRUE gyres garbage patch microplastics Sargasso Sea Loggerhead Sea Turtles Humpback Whales A webmap to analyze ocean gyres and garbage patches, emphasizing microplastics and the critical habitats and migration routes of Loggerhead sea turtles and Humpback whales. The webmap is a class GIS lab assignment in ODU Marine GIS/GEOG 420-520.