Attwood Catalog 2025

44 LIGHTING

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Navigation Overview

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

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

center line (225° total horiz. arc). Mounting: As far fore as possible

Anchor/Masthead Lights For boats under power up to 20m (65.6ft). Light Color: White

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

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

astern (135° total horizontal arc). Mounting: As far aft as possible

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. H

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.

2.5 meters or 8.2 feet

H=one meter or 39-3/8"

H

H

H=one meter or 39-3/8"

H

CA WARNING: Handling recreational marine vessel parts can expose you to chemicals such as phthalates and lead, which can cause cancer and reproductive harm. To minimize exposure, service the vessel outdoors or in a well-ventilated area, wear gloves, and wash your hands. For more information see www.P65Warnings.ca.gov/marine-vessel-parts.

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