On many windy, sun-drenched days in the Florida Keys, an electric catamaran flying the colors of the America Sailing & Diving Club can be seen escorting revelers across ocean waves. Formed in 1973, the club brings together boat owners as well as nonowners who can set sail on the club’s fleet of sailboats that range in size from 22 feet to 44 feet, each designed to keep the club’s carbon footprint to a minimum. The club also offers courses that teach landlubbers basic sailing techniques, such as knot-tying skills so they needn’t fear that their loose engagement ring will fall overboard.