What are examples of natural navigation aids that divers may use during dives?

Natural navigation aids are crucial for divers when orienting themselves underwater, especially in environments where traditional navigation tools may not be available. Ripple marks in the sand, sun brightness, and bottom contours are effective natural aids due to their consistent and recognizable features.

Ripple marks in the sand can indicate water movement and current direction, allowing divers to understand their orientation relative to the shore or a specific point of entry. The brightness of the sun can also provide visual cues, especially for divers who are aware that sunlight typically penetrates from above, helping them maintain an upward orientation. Lastly, the contours of the bottom, such as underwater hills, valleys, and structures, can help divers navigate by providing landmarks that are unique and not likely to change drastically.

The combination of these elements allows divers to track their position, assess their surroundings, and navigate effectively without relying on artificial tools. While other options mention features like coral formations and temperature, the specific examples in this choice offer a more direct application for navigation techniques that divers can easily recognize and utilize during their dives.