Rule 21 - Definitions

Masthead light - white - 225°, from 22.5° abaft the beam on both sides

Port sidelight - red - 112.5° - 6 miles

Starboard side light - green - 112.5° - 3 miles

Stern light - White - 135° - 3 miles

Towing light - yellow - 135° - 3 miles

all around light - various - 360° - 3 miles

Flashing light - various - flashes regular intervals 120 flashes per minute

Special flashing light - yellow - 50 to 70 flashes per minute - INLAND ONLY