attwoodmarine.com LIGHTING 42 Navigation Overview 2.5 meters or 8.2 feet Vertical Separation of Lights Pole length and location determines light separation. On boats under 12 m (39.4 ft.), the all-round or masthead light must be located a minimum of one meter (39-3/8") above the red-green sidelights. One meter must be the height separation measured from bulb filament centers. On boats of 12 to 20 m (39.4 to 65.6 ft), the masthead light must be at least 2.5 m (8.2 ft) above the gunwale. Lighting the Way – Types of Navigation Lights This section is divided into four basic types of navigation lights, differentiated by lens color, beam angle (horizontal cut-off angle), and location on the boat. All lights are for 12V DC applications only. Styles may vary, but the color, cut-off angle, and location must always comply with the following standards: Sidelights For boats under power up to 20m (65.6ft). Light Color: Red (port) and/or Green (starboard) Cut-off: From dead ahead to 112.5° aft on either side of center line (225° total horiz. arc). Mounting: As far fore as possible All-Round Lights For boats less than 12 m (39.4 ft.). The white all-round light may be used in lieu of a masthead or transom light. Light Color: White Cut-off: Unbroken arc of 360° on the horizon. Mounting: As near to the fore and aft centerline as possible Anchor/Masthead Lights For boats under power up to 20m (65.6ft). Light Color: White Cut-off: Unbroken arc from dead ahead to 112.5° aft on either side of center line (225° total horizontal arc), plus 135° dead astern Mounting: Placed over the fore and aft centerline Transom Lights For boats under power up to 20m (65.6ft). Light Color: White Cut-off: Unbroken horizontal arc of 67.5° each side dead astern (135° total horizontal arc). Mounting: As far aft as possible H H H=one meter or 39-3/8" H H H=one meter or 39-3/8"
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