WELCOME TO THAYER MARINE Welcome to Thayer Marine! We offer a variety of marine products and our selection is second to none. Thayer Marine prides itself on having the friendliest and most knowledgeable staff in Jackson, MI. It is our goal to help our customers find the perfect watercraft to fit their lifestyle, along with just the right parts and accessories. Check out our brochures to see what products we offer. If you need help in making your selection, feel free call or stop in—we're always ready to serve you.