Section 4 - Aids to Navigation

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• Welcome to the
• United States Power Squadrons'
• Chart Smart Seminar

Aids to Navigation (Section 4)
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Class Agenda - cont'd

• Section 4 Aids to Navigation
• Marks
• Lateral System
• Non-Lateral System
• Ranges
• Sound Signals
• Additional Topics

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What Navigational Aids Tell Navigators

• Deep, safe water

• Shallow, hazardous water

• Obstructions channels

• Ranges

• And much more

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Lateral Systemclockwise along coasts or
intracoastal waterways
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Lateral SystemThe "3R" Rule

• When Returning from sea,
• Keep Red side of channel marks
• To your Right - starboard

Red - Right - Returning
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MARK AN AID TO NAVIGATION YOU SEE WHILE
BOATING

• TWO CATEGORIES OF MARKS
• Lateral Marks
• Marks starboard and port sides of a route
• Non-Lateral Marks
• Supplemental aids having no lateral significance

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IDENTIFICATION OF MARKS

• In Daylight
• Shapes
• Colors
• Numbers or letters
• Sounds
• At Night
• Light color and patterns
• Sounds

Always Locate Marks On Your Chart
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TYPES OF MARKS

• BUOYS
• Floating marks anchored at specific locations
• BEACONS
• Fixed marks permanently fastened to the earths
  surface
• RANGES
• Indicates center of a channel

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BUOYS

• Floating Aids
• Various shapes and colors

• Position - approximate

• Identified by
• Number, letters, sound devices and lights

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BEACONS
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RANGES

• Marks center of a channel
• Back mark is taller than front mark
• When marks are aligned vertically, you are in
  the center of the channel

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Lateral System
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Lateral System
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USWMS
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Chart Work Class Exercise 2
Using the Bowditch Bay practice chart, determine
What is the type of bottom found in the vicinity
of G C "1" at Shark River
_________________________________ The
characteristics of RG D Fl R Gong (color, light
sequence, sound) ______________________________
___ The special nav aid that is visible when
approaching Oyster River _____________________
_______________ The characteristics of the
stationary aids at the entrance to Perkins
Cove______________________________________
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Chart Work Class Exercise 2
Using the Bowditch Bay practice chart, determine
What is the type of bottom found in the vicinity
of G C "1" at Shark River ___Hrd (hard
bottom) ____________
The characteristics of RG D Fl R Gong (color,
light sequence, sound) _lighted, flashing red,
group of 2 then 1 flashes, sound is a "gong" type_
The special nav aid that is visible when
approaching Oyster River _a range, true
course of 245 degrees when aligned vertically
also, a mid-channel marker, RW "OR", Mo (A) light
seq _
The characteristics of the stationary aids at the
entrance to Perkins Cove _two 24 ft towers,
lighted - flashing, on the end of each breakwater
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End of Section 4
Aids to Navigation