Float In! How does a working waterfront get ready for summer? At Atlantic Challenge in Rockland, it takes the coordination of a crane, 2 pilot boats, 14 Apprentices and many volunteers. Float In marks the opening of the boating season for the Apprenticeshop and Community Sailing Programs of Atlantic Challenge. Work starts at 8:00 a.m. in the waterfront parking lot at 643 Main Street, Rockland, ME. Weather permitting. Public welcome. Call 207-594-1800 for more information.