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Massachusetts Association of Independent Scuba Instructors, LLC

178 East Main Street

Milford, MA 01757

Store: 857-394-3748




Professional Scuba Instruction


NAUICourse Director # 54799

PSI Inspector # 26383

Eddy Current Tech #3622

Certified Class E Air Station

Nitrox, O2 & TriMix

Cylinder Inspections, Hydros, & Tank Cleaning

Valve & Regulator Rebuilding

Authorized OTS, SEAC & XS Scuba Dealer


CPR – AED – First Aid – O2 Training



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Let M.A.I.S.I. be your local dive shop. We offer a full range of classes from Introduction to Scuba through Instructor Trainer with flexible class schedules. We also offer a wide range of specialty programs including: Full Face Mask, Dry Suit, Search and Recovery, and Divers with Disabilities. 

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About us

Massachusetts Association of Independent Scuba Instructors was established in 2013.  We are located in the Metrowest part of Massachusetts 32 miles southwest of Boston.  MAISI, LLC is a NAUI Pro-Gold scuba diving training facility & retail establishment with a Class-E certified Air/Nitrox station.  MAISI, LLC specializes in scuba diving training from Introduction to Scuba through Instructor including public safety diving.  MAISI, LLC employs certified, insured Instructors and Dive Masters.  Our facilities house a training room, office, air compressor & fill station, tank inspection station, and retail sales area.  We also perform routine maintenance and repair on all major brands of tanks, valves, regulators and BC’s.  Our training classes are kept small for more direct, one-on-one training. Our open water check-out dives are performed at Ft. Wetherill RI, Wallum Lake, Webster Lake, Cape Ann, and Rockport, MA. We are a proud business partner and member of DAN (Diver’s Alert Network) and are certified to teach all the Dan Safety programs.

Our product lines include: SEAC, OTS, Shearwater, and XS Scuba. We service all major brands of regulators and BCDs. 

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We support the East Coast Dive Club ( and recommend that all divers join and attend their monthly meetings and weekly dive destinations. 

Joining a dive club is the best way to meet new divers, and learn about new changes in the diving industry.  

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