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Sailboats under power must conform to motorboat navigation light requirements.

If 40 to 65 feet long, these vessels must exhibit the lights as shown in Figure 2:

  • Red and green sidelights visible from a distance of at least two miles (or if less than 40 feet long, at least one mile) on a dark clear night
  • A sternlight visible from a distance of at least two miles.
Fig. 2: Navigation lights for unpowered vessels

An alternative to the sidelights and sternlight is a combination red, green, and white light, which must be exhibited near the top of the mast.