Table of Contents:

U.S. ATON System

Private Aids to Navigation

Safety Tips

Lateral System

Non-Lateral Aids to Navigation

Uniform State Waterway Marking System

Western Rivers Marking System

Visual Buoyage Guide

Nautical Chart

Bridge Lighting & Other Signals

ATON Abbreviations

USCG District ATON Offices

Report ATON Defects

Aids to Navigation — Road Signs of the Waterway

Aids To Navigation Abbreviations

B - Black
Bn - Beacon
C - Can Buoy
F - Fixed F is an illustration of a fixed light, which is indicated by a constant beam.
Fl - Flashing Fl is an illustration of a fixed light, which is a sequence of a short flash followed by a short pause.
Fl (2) - Group Flashing Fl (2) is an illustration of a group flashing light, which is a sequence of two short flashes separated by a short pause, and followed by a longer pause.
Fl (2+1) - Composite Group-Flashing Fl (2+1) is an illustration of a composite group flashing light, which is a sequence of two short flashes separated by a short pause, followed by a medium pause, a single short flash and a long pause.
G - Green
Iso - Isophase Iso is an illustration of an isophase flashing light, which is a sequence of a medium flash followed by a medium pause.
J - Junction (S or T Dayboard)
K - Rectangular (Range Dayboard)

M - Octagonal Dayboard
MO (A) - Morse Code -
( MO is an illustration of Morse code, which is a sequence of a short flash followed a short flash followed by a short pause, a medium flash and another short pause. )
N - Nun Buoy
Oc - Occulting Oc is an illustration of an occulting flashing light, which is a sequence of a long flash followed by a long pause.
Pri - Private
Q - Quick (Flashing)Q is an illustration of a quick flashing light, which is a sequence of a short flash followed by a very short pause.
R - Red
S - Square Dayboard
s - seconds
T - Triangle Dayboard
W - White
Y - Yellow

A Complete listing of Nautical Chart symbols, abbreviations and terms is contained in Chart No. 1publication. This publication is available at most marine stores.

USCG red rod