United States Power Squadron
P.O. Box 30423
Raleigh, NC 27617
NAVIGATIONAL AIDS
Aids to navigation (ATONS) help you to travel safely on the
water. They help you get from one place to another and
are most helpful if you have a nautical chart.
IMPORTANT: NEVER tie your vessel to an ATON. It is
illegal because your boat blocks the ATON from the view
of other boaters. Decreased visibility can contribute to a
serious accident that may result in property damage,
personal injury or death.
There are two ATON systems. The system used on federal
waters is known as the International Association of
Lighthouse Authorities System B (IALA-B). The Coast
Guard maintains this system. The second system is the
Uniform State Waterway Marking System (USWMS). This
system is maintained by state authorities.
International Association of Lighthouse
Authorities System B (IALA-B)
IALA-B uses four types of ATONS. This chapter discusses
the two most common markers: lateral markers and safe
water markers. Other federal markers include special
markers and isolated danger markers. The Navigational
Aids Chart at the end of this chapter, shows these aids.
https://www.boat-manuals.com/lund/
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