- Annapolis SCUBA Center, LLC
- Offers snorkeling lessons, and scuba courses from the beginner level, through instructor, and offer training in many specialized areas of diving.
- Aqua Ventures Online
- Offering a large selection of scuba and snorkeling gear, scuba diving instructions, tropical and local scuba diving trips.
- Aquatic Connection Scuba
- A full-service training facility located in Baltimore, Maryland.
- Blue Marble Divers
- Scuba certification courses, dive travel, equipment sales, service and rental.
- Brass Anchor Scuba Center
- Offering scuba diving lessons, travel, and equipment sales and rentals.
- Columbia Scuba
- Offering scuba diving lessons, travel, and equipment.
- Divers Den
- Offering a full range of diving equipment and services including instruction and certification.
- Mislak Diving
- Offering scuba certification courses, dive travel, equipment sales, service and rental.
- O.C. Diver
- Charters are offered for individuals and groups, air, nitrox, and trimix fills as well as regulator and tank rentals available.
- Sea Dive
- Providing many levels of scuba instruction from junior open water to master diver level training as well as a full range of products.
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