CORRECT CRAFT super air 230 2018 Owner's Manual page 81

Boating Safety
Warning Markers
It is a good idea to ask local authorities if there are hazardous areas
and how they are marked. Boaters must also recognize the flag
designs, which indicate that skin divers are present and keep well
clear of the area. Divers underwater cannot be seen. Stay well away
from boats or floats displaying Diver Flags.
Skin Diver Warning Flag
Watch for swimmers. Swimming areas may not be marked. Steer
clear from the area and remain alert.
Swim Area Warning Buoy
Navigation markers serve as a means of identifying navigable
routes, and indicate water hazards. Boaters should become familiar
with navigation markers and stay within marked boundaries and
clear of hazards.
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