Underwater Navigator It’s easy to get disoriented underwater if you don’t know how to use a compass or natural navigation clues. Learn how to easily find your way back to the boat or shore without returning to the surface and avoid long, exhausting swims. The PADI Underwater Navigator course fine-tunes your observation skills and teaches you to more accurately use your compass underwater. Valuable for any diver, but should be considered essential for divers diving without a dive professional, especially from shore. Especially crucial for divers in low-visibility environments.