SSI's ConEd Ratings have the highest requirements in the industry. They are not courses perse; rather, they are flexible requirements, that can be met in a variety of ways, allowing you to personalize your continuing education path. SSI Specialty Diver. SSI's intermediate diver rating. Higher than any other agency's advanced courses. SSI Advanced Open Water Diver. SSI's Advanced Diver rating stands alone in the industry with the highest combination of diving knowledge and experience. No other agency's advanced diver level compares. SSI Master Diver. SSI's Master Diver rating is one of the most elite ratings in diving toady. Divers that have completed this level have combined the knowledge, skills and experience to truly call themselves Master Divers.