Can you hover perfectly still at a given spot like a helicopter? Or do you find yourself constantly moving like an airplane in order to prevent from crashing? SDI Advanced Buoyancy course is designed to increase divers understanding of the factors that influence buoyancy, and to train them in advanced buoyancy control methods. Glide through the ocean effortlessly, hold perfectly still in one place, extend your dive time, reduce your air consumption and free your hands for camera, line laying etc. No matter what your diving interest, having perfect buoyancy is the key to success.