3A Marine Service has been a trusted name in Boston Harbor for over 50 years, serving recreational boaters, commercial operators, and public safety agencies. Covering the South Shore, Boston, North Shore, Cape Cod, and beyond, they are authorized dealers for Robalo, Parker, and Four Winns boats, plus top outboard brands. With 5-star MRAA certification, expert service, and a full retail store, they keep boaters on the water.