America’s Boating Course
3rd Edition
Navigation Aids
Chapter 2
Section 5
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What Type of Aids?
Lateral aids
• Side of the channel
• Preferred channel
Non-lateral aids
• Danger, safe water
• Information, regulatory
• Special
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Appearance of Aids
Buoys
• Float & moored to bottom
• Can drift
• May be lighted
Beacons
• Fixed to bottom
• Can’t move
• May be lighted
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Red – Right – Returning
R
R
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R
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Red Marks - Nuns
Even numbers
Unlighted
Lighted
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Green Marks - Cans
Odd numbers
Unlighted
Lighted
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Daymarks
Lighted
Unlighted
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Preferred Channel Mark
Light is color of
top band
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Safe Water Mark
Center of channel
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Regulatory Marks
White cylindrical
buoys
Symbol indicates
purpose
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Isolated Danger Marks
2 balls – one over
other
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Special Marks
Always yellow
May have yellow light
May have seals
Intracoastal Waterway
Yellow or other lateral
marks
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Labels for Marks
Green - Odd numbers
Red - Even numbers
Numbers increase away
from seaward
Always in “quotes” on
charts
Numbers may be missing
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Chart Labels
Lighted buoy – Magenta
disc
Lighted beacon –
Magenta flare
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Navigation Aids
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Light Colors
Chart shows light colors (R-G-Y)
• R & G: buoys having lateral significance
• Y: special marks
Some marks have white light
• Safe-water Mo (A)
• Isolated Danger
• Dayboards
Light may have pattern
• Example: Fl (2+1) R
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Light Patterns
Used to distinguish between marks
Short, Long, Quick
Pattern labeled on chart
Intervals of flashes
• Flash, Quick, Iso, Occult, Mo A
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Light Patterns
Flashing
Occulting
Composite
flash (2-1)
Mo(A)
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Animated
>>
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Ranges
Help stay in channel
Back aid is taller
May be lighted
Shown on chart
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Align on a Range
Animated
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Sound Signals
Bell
Gong
Horn
Whistle
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Intracoastal Waterway System
Protected waterways on
East coast & Gulf of
Mexico
Uses yellow symbols on
standard marks
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Uniform State Waterway
Marking System
Informational & Mooring Buoys
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Remember the Aids
You tell us … a group activity
What is it?
What color?
Odd, even, or lettered?
Which side?
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ID Mark 1
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ID Mark 2
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Boating is fun… we’ll show you how
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collage
Remember the Marks
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32 LAST
End Section 5
Boating is fun… we’ll show you how
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END