cylindrical buoy

Floating beacon with a cylindrical superstructure.

light

Encoded light beam that serves as a navigation aid at night.

photovoltaic panel

Device that converts solar energy into electricity to power the light.

daymark

Navigation aid that is visible by day only; it displays various colors and signage.

mooring chain

Long, very sturdy chain that links the buoy to the sinker.

sinker

Heavy object often made of concrete; it rests on the bottom of the waterway to keep the buoy in place.

bridle assembly

Two chains that link the flotation section to the mooring chain.

flotation section

Lightweight base that keeps the buoy afloat and upright.

superstructure

Metal frame that forms the buoy’s body and contains all its elements.

topmark

Metal cone-shaped part atop a buoy that serves as a navigation aid during the day; its position signifies various meanings.