The largest parts inventory in Northern Illinois. Established in 1975, D's Marine Service has been serving boating enthusiasts in McHenry and surrounding counties for more than 35 years. Customers have come to rely on the expertise of the D's staff. You'll always find courteous professional people offering a wealth of experience and knowledge. D's is a full-service marina offering one of the largest parts inventories in northern Illinois. They service every major brand of engine and all foreign outboards. Certified technicians service Mercury, Mariner, Force, Chrysler, Johnson and Evinrude. Mercruiser, OMC Cobra and Volvo Penta stern drives. They offer every service you can think of from boat maintenance and engine repair, to the littlest detail of repairing canvas, interior, fiberglass, gel coat, skegs, props and trailers. The harbor has 98 slips available in the summer and dry storage in the winter.