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5 Your “Highway” Signs Chapter
Copyright Coast Guard Auxiliary Association, Inc. 14th ed.
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Chapter 5 Your “Highway” Signs
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Lesson Objectives Aids to Navigation (ATONS) Cautions in using ATONS
Meaning of charts symbols Availability of electronic ATONS Reference materials – changes in ATONS
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Buoyage System There are 4 Buoyage Systems in US US ATON System
Intracoastal Waterway System Western Rivers System Private Aids to Navigation – PATONS
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US Direction of Bouyage
Red, Right, Returning Returning from sea! Clockwise around U.S. Numbering system
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US ATON System
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US ATON System
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US ATON Lateral System Made up of Shapes, Colors, Alpha Numeric, and Lights
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ATON Channels INTRACOASTAL WATERWAY INTRACOASTAL WATERWAY
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ATONS Help determine a safe course Help determine where you are
Help navigate to reach destination Are shown on chart Any object visible from the water
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ATONS Short Range Buoys Day beacons Lights Major lights
Directional or sector lights Ranges Racons Sound Signals
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ATONS Anything visible from the water
Towers and smokestacks (usually lighted) Monuments Bridges Distinctive land formations Buildings Objects must appear on chart to take accurate fixes
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ATONS ATONS are protected by law Do not: Alter Destroy Move Tie up to
Climb on Obscure others view
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Isolated Danger
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Safe Water
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Special Marks
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Information and Regulatory
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Mooring Buoy
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Student Activity What are types of ATONS? CANS NUNS Preferred
Channel Marker Safe Water Marker 1 2 3
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Uniform State Waterway Marking System
Merged with US ATON system in 2003
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Waterway Marks/Buoys Characteristics Reprinted with permission from
The Weekend Navigator by Bob Sweet
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Waterway Marks / Pillar Buoys
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Waterway Marks / Spherical Buoy
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Waterway Marks/Nun & Can Buoy
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Waterway Marks/Cautions
Watch circle Position Approximate - PA Light and acoustics may fail Off station due to drifting
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Waterway Marks/Day Beacons
Daymarks Day beacon
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Waterway Marks Triangular Daymark Square Daymark
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Waterway Marks Diamond shaped day marks Location Only
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Waterway Marks Safe Water ATONS
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Waterway Marks Preferred Channel Mark
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Waterway Marks Light structures
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Waterway Marks Ranges Pair of ATONS Rear ATON higher
Determines center of channel May be lighted or not
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Student Activity Name different Waterway Marks Range Markers
Day Markers Regulatory Markers 1 2 3
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Light Characteristics
Fixed - ON continuously Occulting - ON time greater than OFF Isophase -ON time equal to OFF Flashing (2.5, 4, or 6 Sec) Quick flashing
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Light Characteristics
Preferred channel lights Color Green or Red Characteristic: 2 flashes followed by 1 flash
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Chart Symbols Symbols for fixed lights Symbols for buoys
Symbols for day marks
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Intracoastal Waterway
ICW Yellow triangles, squares Note yellow on marks
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Intracoastal Waterway
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Intracoastal Waterway
Dual Purpose Marks Used to mark coastal waters and ICW Sometimes: yellow triangle on square lateral mark, or a yellow square on triangle lateral mark If following ICW, use yellow marks If following main channel, follow red/green lateral marks
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Light Structures Light houses Classes of lights Light structures
Light sectors Sound signals
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Lights on Bridges Bridges marked on charts by type:
Fixed, Swing, Bascule, Lift, etc. Lights on bridges are not part of buoyage system Drawbridges RED Lights - Bridge is closed GREEN Lights - Bridge is open Green lights mark channel centerline for fixed bridge - Red lights mark sides of channel Preferred channel marked with white lights
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Electronic ATONS GPS RACON Global Positioning System (GPS)
Differential GPS Wide Area Augmentation Systems (WAAS-GPS) RACON RAdar beaCON
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Navigation Publications
Local notice to mariners Local Notice to Mariners Online Chart No. 1: Nautical Chart Symbols, Abbreviations, and Terms Light List (Seven Volumes) Coast Pilots Approved by DC-E USCG AuxA, Inc
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Thank you Illustrations provided by McGraw Hill Education The
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