The preferred channel to starboard port is indicated
In some navigable bodies of water, the area having
Color: Green with one broad red horizontal
the best navigable water needs to be marked. Some of
the reasons for marking the area are as follows:
Shape (buoys): Can, pillar, or spar
Topmark (when required): Single green can
To indicate the deepest water in the area.
Light (when fitted)
To indicate the safe side on which to pass a
Phase characteristics: Composite group
flashing (2 + 1)
To draw attention to a feature in a channel, such
as a bend, junction, branch, or end of a shoal.
Such an area is indicated by a cardinal mark, or
In buoyage Regions A and B, if marks at the
buoy, that is placed in one of the four quadrants (north,
sides of a channel are numbered or lettered, the
east, south, or west) from the best water. A cardinal
"conventional direction of buoyage."
mark takes its name from the compass quadrant in
Figure 6-21.--IALA Maritime Buoyage System, International
Figure 6-22.--IALA Maritime Buoyage System, International
Buoyage Region B, preferred channel to port.
Buoyage Region B, preferred channel to starboard.