What defines the arc of visibility for a towing light?

The arc of visibility for a towing light is specifically defined as extending from 22.5 degrees abaft the beam to the bow of the vessel. This definition is crucial in maritime navigation as it ensures that the towing operation is properly indicated to other vessels, enhancing navigational safety. The light must be visible over this specific arc to alert other mariners of the towing vessel's presence and intent, allowing them to take necessary precautions.

A towing light is typically positioned at the stern of the towing vessel and must be seen from the front and sides, but it doesn’t need to be visible from the directly behind the vessel, which is why only having visibility to the stern or all around the vessel is not correct. Moreover, visibility from the bow to the stern encompasses more than is required for a towing light, thereby diverging from its defined arc. The emphasis on 22.5 degrees abaft the beam establishes clear parameters for the light's purpose and function in navigation, ensuring that other vessels can safely interpret the towing situation.