Rule 23 — Power-driven Vessel Underway (lights)

33 CFR §83.23

§ 83.23 § 83.23 Power-driven vessels underway (Rule 23). (a) A power-driven vessel underway shall exhibit: (i) A masthead light forward; (ii) A second masthead light abaft of and higher than the forward one; except that a vessel of less than 50 meters in length shall not be obliged to exhibit such light but may do so; (iii) Sidelights; and (iv) A sternlight. (b) An air-cushion vessel when operating in the non-displacement mode shall, in addition to the lights prescribed in paragraph (a) of this Rule, exhibit an all-round flashing yellow light where it can best be seen. (c) A WIG craft only when taking off, landing and in flight near the surface shall, in addition to the lights prescribed in paragraph (a) of this Rule, exhibit a high intensity all-round flashing red light. (d) …