attwoodmarine.com LIGHTING 43 Boats Underway This section outlines the navigation lighting required according to current U.S. Coast Guard and 72 COLREGS (International Waters) regulations. When underway, the required navigation lights are: Boats at Anchor When anchored in other than designated areas, any boat under 50 m (164 ft.) must have a 360° white light in view (a single all-round light, a masthead and transom light, or other means). Small, Oar-Driven Boats: • Sidelight pair or combined—1 mile • Transom Light—2 mile • Flashlight or lighted lantern. • Various other light requirements are outlined in the standards regarding towing, vessels aground, and other special conditions • Consult the Inland Navigation Rules, 72 COLREGS, or USCG for details. Sailboats 7 to 20 m (23 to 65.6 ft.) under sail: Three different light configurations may be acceptable: 1. Sidelights & Transom Light. 2. A Sidelight & Transom Light combined in one light (a Tri-Color Light) mounted at or near top of mast. 3. Sidelights & Transom Light, or two All-Round Lights, mounted at or near the top of the mast, the upper light being red and the lower green. Power-driven boats less than 12 m (39.4 ft.) with max. speed over 7 knots: • Sidelight pair or combined-1mile • All-Round Light—2 mile or Masthead Light—2 mile with Transom Light—2 mile. Power-driven boats 12 to 20 m (39.4 to 65.6 ft.): • Sidelight pair or combined—2 mile • Masthead Light—3 mile and Transom Light—2 mile. • All-Round Light may not be used. Sailboats Under Motor Power: When under power, sailboats are considered power boats and must operate with power boat lights as previously outlined. Sailboats less than 7 m (23 ft.) under sail: • Sidelight pair or combined-1 mile • Transom Light—2 mile • Flashlight or lighted lantern.
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