Sure Marine Service, Inc. Provide Sales and Service of fine Webasto marine heating, Cruisair air conditioning, MasterVolt electrical equipment, AC/DC marine refrigeration, propane galley ranges and barbeques. Sure Marine Service, Inc. is located 2 blocks east of The Hiram M. Chittenden Locks in Ballard. Sure Marine supplies and services heating, cooling, and galley equipment for small boats to large mega yachts.