United States Coast Guard U.S. Coast Guard Auxiliary Approved USCG Auxiliary - Department of Education Copyright ©2004 Coast Guard Auxiliary Association,

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

213 DEC 04Basic Coastal Navigation - Chapter 4


Navigator’s ToolsNavigator’s Tools



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



PlottersPlotters

Draw straight lines.

Measure angles with respect to longitude.

e.g. Measure directions

Many types.

Choose according to personal preference.



Parallel Rules

Plotting ToolsPlotting Tools

Paraglide

Course Plotter

Course Protractor

Three-ArmProtractor

Vecta Rose

Paraglide(Compact)



More Plotting ToolsMore Plotting Tools

Chart Protractor

Triple Parallel

Rules

Protractor

Triangles



DividersMeasure or mark off distances on a chart.

Pointed both arms.

Drafting compass.Used for swinging an arc.

Dividers & CompassDividers & Compass

Compass

Dividers



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



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



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.



Depth Sounder & GPSDepth Sounder & GPS

Depth sounder:Help prevent groundings.Aid in position-finding.

GPS:Position finding.Advanced navigation-related computations.



SextantSextant

Classic use for celestial navigation.

Also useful for measuring horizontal and vertical angles

e.g. Distance off from vertical angle.



Other ToolsOther Tools

Electronics:Radio Direction Finder

Radar

Loran C

Optical Range Finder

Lo-Tech StuffPaper

Pencils

Erasers

Pencil sharpener

Magnifier



References:Nautical Chart NO. 1

References:Nautical Chart NO. 1

Explanation of nautical chart:

Symbols

Abbreviations

Terms



References:Tide & Current Tables

References:Tide & Current Tables

Predictions of tidal events:

Tides

Tide differences

Tidal currents

Tidal current differences



References:Notices to Mariners

References:Notices to Mariners

Updates and corrections:

Charts.

Hazards to navigation.

Available on-line.

http://www.navcen.uscg.gov/



References:Computer Programs

References:Computer Programs

Tide & tidal current predictions

Charts

Real-time chart plotting

Voyage planning

Vessel management



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.



Your Most Important ToolYour Most Important Tool

PREPARATIONPREPARATIONPREPARATIONPREPARATION



End of Chapter 4End of Chapter 4

Documents

United States Coast Guard U.S. Coast Guard Auxiliary Approved USCG Auxiliary - Department of Education Copyright ©2004 Coast Guard Auxiliary Association,