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United States Coast GuardU.S. Coast Guard Auxiliary
United States Coast GuardU.S. Coast Guard Auxiliary
Basic Coastal Navigation - Chapter 4Approved USCG Auxiliary - Department of Education
Copyright ©2004 Coast Guard Auxiliary Association, Inc.
BasicCoastal Navigation
BasicCoastal Navigation
Chapter 4Chapter 4
Navigator’s Tools & InstrumentsNavigator’s Tools & Instruments
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Copyright ©2004 Coast Guard Auxiliary Association, Inc.
Navigator’s ToolsNavigator’s Tools
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Good Quality Tools:Buy the best quality you can afford.Plated, stamped steel perish quickly in marine environment.Good tools, good care = long life.
Good TechniqueUse the right tool for the purpose.Practice using the tool.
Accuracy Depends OnAccuracy Depends On
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PlottersPlotters
Draw straight lines.
Measure angles with respect to longitude.
e.g. Measure directions
Many types.
Choose according to personal preference.
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Parallel Rules
Plotting ToolsPlotting Tools
Paraglide
Course Plotter
Course Protractor
Three-ArmProtractor
Vecta Rose
Paraglide(Compact)
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More Plotting ToolsMore Plotting Tools
Chart Protractor
Triple Parallel
Rules
Protractor
Triangles
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DividersMeasure or mark off distances on a chart.
Pointed both arms.
Drafting compass.Used for swinging an arc.
Dividers & CompassDividers & Compass
Compass
Dividers
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Reliable time piece essential:
Dead reckoning navigation.Running a search pattern.Identifying light patterns.
24 Hour display helpful.Stopwatch a useful function.
Watch or ClockWatch or Clock
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Used to solve problems in
time - speed – distance.
If you know two variables,
you can solve for the third.
Alternate: solar or battery
powered calculator.
Nautical Slide RuleNautical Slide Rule
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Binoculars andHand-held Compass
Binoculars andHand-held Compass
BinocularsLocating ATONS, Landmarks
Use 7 X 50
Hand-held CompassVisual bearings on ATONS or landmarks to establish LOP.
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Depth Sounder & GPSDepth Sounder & GPS
Depth sounder:Help prevent groundings.Aid in position-finding.
GPS:Position finding.Advanced navigation-related computations.
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SextantSextant
Classic use for celestial navigation.
Also useful for measuring horizontal and vertical angles
e.g. Distance off from vertical angle.
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Other ToolsOther Tools
Electronics:Radio Direction Finder
Radar
Loran C
Optical Range Finder
Lo-Tech StuffPaper
Pencils
Erasers
Pencil sharpener
Magnifier
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References:Nautical Chart NO. 1
References:Nautical Chart NO. 1
Explanation of nautical chart:
Symbols
Abbreviations
Terms
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References:Tide & Current Tables
References:Tide & Current Tables
Predictions of tidal events:
Tides
Tide differences
Tidal currents
Tidal current differences
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References:Notices to Mariners
References:Notices to Mariners
Updates and corrections:
Charts.
Hazards to navigation.
Available on-line.
http://www.navcen.uscg.gov/
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References:Computer Programs
References:Computer Programs
Tide & tidal current predictions
Charts
Real-time chart plotting
Voyage planning
Vessel management
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Other ReferencesOther References
Coast PilotWritten descriptions and navigational advice regarding waterways.
Light ListTabular compilation of ATON locations and descriptions.
Cruising guidesCommercially produced waterway descriptions and cruising advice.
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Your Most Important ToolYour Most Important Tool
PREPARATIONPREPARATIONPREPARATIONPREPARATION
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End of Chapter 4End of Chapter 4