Through a theory presentation, dry land practice and two dives in open water you’re going to learn how to safely deploy a delayed surface marker buoy, and how to ascent efficiently using one. Over the course of the day, you will have a chance to practice with different styles of DSMB including those filled from a low-pressure inflator hose, those with self inflate mechanisms and simple open-bottomed styles too, so you gain an understanding of the pros and cons of each. We will also look at what style of line carrying system you prefer, from a large reel to a simple spool.