What is the visual line established by lining up two permanent objects called?

The visual line established by aligning two permanent objects is referred to as a range. This term is commonly used in navigation and underwater orientation to help divers maintain a straight path or specific direction underwater. By lining up two stationary objects, divers can create a visual reference point which aids in navigation, ensuring they stay on course and avoid getting lost or disoriented.

Ranges are particularly useful in underwater environments where visibility may be limited and divers rely on visual cues from their surroundings. This technique enhances safety and efficiency during dives, allowing divers to navigate effectively between different sites or to a designated location. Understanding how to establish and use a range is an essential skill for advanced divers.