The navigation lights required on a vessel are determined by its size, type, and the conditions under which it operates, as outlined in the International Regulations for Preventing Collisions at Sea (COLREGs). Vessels are classified into categories such as power-driven, sailing, and fishing vessels, each with specific light configurations. Additionally, the operational context, such as whether the vessel is at anchor or underway, also influences the required lighting. Compliance with these regulations ensures safety and visibility on the water.
during periods of restricted visibility
all boats operating between sunset and sunrise. - jr
All around white light
A sailboat under sail that is 21 feet in length must display a combination of navigation lights, which typically include a white stern light and a red and green sidelights. The red light should be displayed on the port side (left) and the green light on the starboard side (right). If the sailboat is not under power, it is not required to display a masthead light, but the sidelights and stern light must be visible. These lights ensure visibility to other vessels during nighttime or low visibility conditions.
They must only carry a working flashlight!
AT NIGHT!30 minutes prior to sundown and thirty minutes after sunup
Navigation lights must be on during periods of restricted visibility.
Any vessel over 7 meters is required to show Navigation lights between sunset to sunrise and in any times of restricted visibility. See Rule 20, Application. For a full list of Navigation Rules, see the link below.
In accordance with rule 28 of the 72 COLREGS a vessel 'constrained by her draft' shall display 3 red lights vertically in addition to other navigation lights. Please see the link provided below.
Warship use the same navigation lights as civilian ships. Additional lights may be shown if engaged in special duties.
Navigation lights
On power-driven vessels, navigation lights must be on during periods of restricted visibility.