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It's a lot different. For one, OW class checkout (ocean/lake, etc.) dives are after maybe 8 hours of pool training in the most benign of settings possible. As well, even with courses that are taught "kneeling", there still is usually time to just swim around in the pool to figure out buoyancy. On a cruise I was on before I was certified I could have taken a DSD-- they were doing the 1 hour training in the ship's pool. Not enough for me-- I took the snorkeling tour instead.How is that different in an OW class?