With regard to a sailing vessel, what are the requirements regarding vertical sectors/minimum intensity of navigational lights as fitted?

The requirement stating that navigational lights on a sailing vessel must have a minimum intensity of 10 candela is aligned with the International Regulations for Preventing Collisions at Sea (COLREGs). This standard ensures that the lights are bright enough to be seen from sufficient distances under normal conditions, thereby providing vital information to other vessels regarding the presence and positioning of the sailing vessel.

The intensity of 10 candela applies specifically to the all-round white light and, in the case of sidelights, is a critical part of maintaining safe navigation practices. Adequate intensity is essential to prevent collisions, as it ensures visibility even in adverse weather conditions or when vessels approach from various angles.

While visibility from 360 degrees, specific angles for navigation, and fitting lights on the mast are considerations in maritime navigation, they do not directly pertain to the minimum intensity required for illuminance as outlined in the regulations. Ultimately, 10 candela serves as a fundamental benchmark for ensuring that navigational lights meet safety requirements effectively.