The PADI Underwater Navigation course teaches divers to navigate while making multiple turns by guiding them through a series of structured exercises. Divers practice setting a heading with their compass, making a series of turns, and then returning to their starting point or reaching a predetermined location. The course emphasizes the importance of accurate compass use, maintaining situational awareness, and checking their position regularly to ensure they stay on course. By repeating these exercises, divers develop the skills needed to confidently navigate complex underwater routes and enhance their overall diving proficiency.