Allen Harbor Marine of Harwich is Cape Cod and MA's leading marine, boats sales and service dealership - New and per-owned used boats dealer and Yacht Broker for North Atlantic Inflatables. We offer professional boat service & engine repairs of Yamaha outboard, Honda Marine Engines, Mercruiser and Mercury Outboards and all major brands by certified technicians. Huge Boat Parts & Accessories Department open for customers in Harwich, Cape Cod, Massachusetts.