74 Chapter Two
terns with green lateral markers showing
single flash or ISO and red showing double
flash or ISO.
• Differences are shown in Figure 5-21. Figure
5-21 also includes the Uniform State
Waterway Marking System (USWMS)
as a matter of information. USWMS
was discontinued in 2003, and has been
mostly replaced by the U.S. Standard System.
116
117
Figure 5-21. Western Rivers System—Differences