White Masthead Light
A masthead light is a white navigation light placed on a vessel's centerline (from bow to stern), visible over an arc of 225 degrees. It shines forward and to either side, from directly ahead to slightly abaft the beam (22.5 degrees to the side). This light is a standard requirement for power-driven vessels and helps to indicate the direction and location of the vessel to other mariners.
Specification
Angle : 225.5°
Visibility : 2NM
Lumen: 98LM
Weight: 0.52kg
Height: 70mm W x 63mm H
Here's a more detailed explanation:
Purpose:
The masthead light helps prevent collisions by indicating the vessel's direction and location, especially in low visibility or at night.
Placement:
It's located on the vessel's centerline, typically forward and slightly above the deck.
Visibility:
The light must be visible over an arc of 225 degrees, meaning it shines from directly ahead to a point slightly behind the vessel's beam on either side.
Requirements:
Power-driven vessels, including those under engine power, are required to display a masthead light. Sailing vessels, when under sail, do not require a masthead light; they instead use sidelights and a sternlight.
Vessel Size:
On vessels under a certain length (e.g., under 12 meters, 2 nautical miles visibility), the masthead light and sternlight can be combined into a single all-round white light. Larger vessels may have multiple masthead lights.
