On the starboard side a green light showing from right ahead to two points abaft the beam, visible at a distance of two miles.
On the port side a red light similar in all respects, except color, to the green light.
To prevent these green and red lights from being seen across the bow they must be fitted with inboard screens projecting at least three feet forward from the light.
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.
Small vessels that cannot carry fixed side lights in bad weather must have them on deck on their respective sides ready for instant exhibition on the approach of another vessel.
All vessels at anchor shall show where it can best be seen, at a height not exceeding twenty feet above the hull, a white light in a globular lantern of eight inches in diameter, visible all round the horizon at a distance of at least a mile.
Pilot vessels shall only carry a white light at the masthead, visible all round the horizon, and shall exhibit a flare-up light every fifteen minutes.
Open boats are not required to carry fixed sidelights, but must, in default of such, be provided with a lantern, having a green slide on one side and a red slide on the other, which must be properly shown in time to prevent collision, taking care that the green light shall not be seen on the port side nor the red light on the starboard side.
Fishing and open boats, when at anchor or riding to their nets and stationary, shall exhibit a bright white light, and may, in addition, use a flare-up light if deemed expedient.