Signals for a Power-driven Ship Under Way (At Night)Two Masthead Lights (If the vessel is less than 50 metres in length, then only one light would suffice). These lights are carried one behind the other on the two masts. The forward light is lower than the after light. Their visibility is at least 6 miles and they show a white light over an arc of 20 points of the compass (225°), namely from right ahead of two points abaft the beam on either side. Two Side Lights A green light on the starboard side and a red light on the port side; these are generally carried abreast the bridge and are provided with special screens so that each light is visible only on its own side from right ahead to two points abaft the beam. Screens are painted matt black. Visibility of these lights is at least 3 miles. One Stern Light It is fixed right astern and shows a white light over an arc of twelve points of the compass (135°) namely from right. Ship at Anchorage A ship of 50 metres or more in length will have one white light in the fore part of the vessel and a second white light at a lower level near the stern. Both lights are to be visible all around the horizon for a distance of at least 3 miles. If the ship is less than 50 metres long, only one all round white light is required. It may be of reduced visibility as well, but of not less than 2 miles.
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