SDI Navigation eLearning Code Do away with shipping fees and excess inventory in your store and go completely digital with this new Code Only option. Divers are intensely fascinated by navigation¦ It allows them to make their way back to a special spot discovered on an earlier dive. They use the tricks and techniques of navigation to find an ideal exit point at the end of a dive without the need for an uncomfortable surface swim.Your SDI Underwater Navigation Specialty course will help you overcome the obstacles inherent to finding your way underwater. You will learn how easy and simple navigation can be and how it will help you both above and below the surface. During this course, you will review natural aids such as sand ripples or reef formations, which can accurately predict your route. Tools such as mechanical or digital compasses are a surprising challenge to the novice but we will help you unravel the challenge and teach the practical skills and techniques you'll need to use them effectively. This course is designed to give students a greater understanding and experience on how to properly navigate underwater using both natural and compass navigation.