Underwater Navigation
Keep the needle aligned with the double marks for the first half of your course.Keep the needle aligned with the single mark during your return course.Setting a Reciprocal Course
A reciprocal course is a straight path to a destination and back to your starting point. To dive a reciprocal course:
- Point the compass's lubber line towards your destination.
- Turn the bezel until the double index mark aligns with the magnetic north needle.
- Begin navigating your course. You are swimming in the correct direction if the needle aligns with the two index marks.
- When you reach your turn-around point, turn around until the needle aligns with the single index mark, and keep them aligned as you swim back to your origin.
