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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
• Ranges
• Deep, safe water
• Shallow, hazardous water
• Obstructions & channels
• And much more …
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Lateral System
clockwise 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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TWO CATEGORIES OF MARKS
Lateral Marks•Marks starboard and port sides of a route
Non-Lateral Marks•Supplemental aids having no lateral significance
“MARK” AN AID TO NAVIGATION YOU SEE WHILE BOATING
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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 earth’s 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
Chart symbol• Diamond with a small position circle • Magenta disc around position circle, if lighted
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“BEACONS”
Permanently fixed to Earth's surface
Examples: • Lighthouses• Daybeacons
Identified by: • Numbers, letters, sound devices, lights
Chart symbols: • Unlighted - small triangle or square• Lighted - magenta flare with a black position dot
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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:
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_
What is the type of bottom found in the vicinity of G C "1" at Shark River ___Hrd (hard bottom) ____________
The characteristics of the stationary aids at the entrance to Perkins Cove _two 24 ft towers, lighted - flashing, on the end of each breakwater
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 _
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End of Section 4
Aids to Navigation