masthead light - Also known as a steaming light. The masthead light is a white light that is visible for an arc extending across the forward 225° of the boat.
Masthead Light
This white light shines forward and to both sides and is required on all power-driven vessels. A masthead light must be displayed by all vessels when under engine power. The absence of this light indicates a sailboat under sail.
Masthead light - 225º white light showing
ahead to 22.5º abaft the beam on both sides
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masthead light - A white-colored light, near/at the masthead; this light indicates a powered, underway vessel at night.
masthead man - In yacht parlance, the man who goes aloft to lace a topsail.
a masthead light, 5 miles; except that where the length of the vessel is less than 20 metres, 3 miles;
a sidelight, 2 miles;
a sternlight, 2 miles;
a towing light, 2 miles;
a white, red, green or yellow all-round light, 2 miles.
A "masthead light" means a white light placed over the fore and aft centerline of a pleasure craft showing an unbroken light over an arc of the horizon of 225 degrees and so fixed as to show the light from right ahead to 22.
The masthead light is used in a number of ways but always has the same characteristics and orientation. It points forward and is normally the highest navigation light on the vessel.
Also known as a masthead light. The steaming light is a white light that is visible for an arc extending across the forward 225° of the boat. When lit the steaming light indicates that a vessel under power, including sailboats with engines running.
In addition to the three-colored running lights used by all boats, a powerboat must show a white masthead light visible from the front. This light must be mounted higher than the running lights.
Steamships towing other vessels shall carry two white masthead lights in addition to their side lights.
Sailing vessels when under way or being towed shall carry only the green and red lights as provided for steamships under way.
 See also: Masthead, After, Boat, Point, Course
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