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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