CORRECT CRAFT super air 230 2018 Owner's Manual page 78

Section 1
Lights, bells and horns are used on buoys for night or poor visibility
conditions. Buoys with unique light flashing characteristics are
identified on nautical charts with the specific flashing pattern.
Types of Buoys
There are several types and shapes of buoys. Buoys may be
unlighted, lighted, with sound or may have both an audible and a
visual signal. Lights, bells and horns are used on buoys for night or
poor visibility conditions. Different shapes of buoys are shown
below.
Unlighted Bell Buoy
Spar Buoy Nun Buoy
Lighted Buoy Can Buoy
FWMS Marking System
Buoys with unique light flashing characteristics are identified on
nautical charts with the specific flashing pattern.
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