Manuals for a 1976 Starcraft boat are available in PDF for download at the iBoats website. The downloads are free. Four 1976 models are listed on the site, including the Sea Scout 16, Seneca DE, Sequoya DE and Sioux Square End.
iBoats is a vast user group for practically every type of boat, and is a fabulous resource for information, photos, support, and owner's manuals. Other options for finding owner's manuals for older Starcraft vessels include Ebay and Craigslist, where owners sometimes post such items for sale or trade. User forums abound on the Internet for Starcraft enthusiasts, and anyone having trouble locating an older owner's manual should try asking other owners on these forums.
Starcraft Marine has brochures and manuals for newer model boats but does not stock nor sell older manuals from their website. Founded in 1903, Starcraft Marine is a popular manufacturer of fishing, cruising and sport boats in the United States. They are known for their durability, and many past models are still on the water today. Older, used Starcraft boats seldom have original documentation with them at the time of sale, so owners seeking an original manual often have to resort to finding one online or from another owner.