MARITIME BUOYAGE SYSTEM
Until recently, as many as 30 different buoyage
systems were in use around the world. In 1982, most
of the maritime nations of the world signed an agree-
ment sponsored by the International Association of
Lighthouse Authorities (IALA). This agreement
adopted a system known as the IALA Maritime
Buoyage System and provides rules that apply to all
fixed and floating marks other than lighthouses, sec-
tor lights, range lights, lightships, and large automatic
navigational buoys (LANBYs).
The Maritime Buoyage System provides five types
of marks that may be used in any combination. The
five types of marks are lateral, cardinal, isolated
Figure 23.Basic buoy shapes.