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Boating Skills And Seamanship 1 Copyright 2007 - Coast Guard Auxiliary Association, Inc. Introduction To Navigation Chapter 9.

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Presentation on theme: "Boating Skills And Seamanship 1 Copyright 2007 - Coast Guard Auxiliary Association, Inc. Introduction To Navigation Chapter 9."— Presentation transcript:

1 Boating Skills And Seamanship 1 Copyright Coast Guard Auxiliary Association, Inc. Introduction To Navigation Chapter 9

2 Boating Skills And Seamanship 2 Copyright Coast Guard Auxiliary Association, Inc. Lesson Objectives Selecting and keeping charts current Constructing and reading charts Use of navigation tools Select, adjust, mount, and correct a compass Plot a course and measure direction

3 Boating Skills And Seamanship 3 Copyright Coast Guard Auxiliary Association, Inc. Lesson Objectives (2) Determine position by compass bearings Computing speed, time and distance Make a dead-reckoning plot Use of tide tables Electronic navigation

4 Boating Skills And Seamanship 4 Copyright Coast Guard Auxiliary Association, Inc. Nautical Charts Availability Download free from NOAA & other sites Designated stores print up-to-minute on demand Dates

5 Boating Skills And Seamanship 5 Copyright Coast Guard Auxiliary Association, Inc. Nautical Chart Features Projections Mercator Projections Reprinted with permission from The Weekend Navigator by Bob Sweet

6 Boating Skills And Seamanship 6 Copyright Coast Guard Auxiliary Association, Inc. Nautical Chart Features Projections Polyconic Projections

7 Boating Skills And Seamanship 7 Copyright Coast Guard Auxiliary Association, Inc. 5-A Chesapeake Bay : B Chesapeake Bay : Nautical Chart Features Chart Scales 5-C Chesapeake Bay : D Chesapeake Bay : Reprinted with permission from How to Read A Nautical Chart by Nigel Calder

8 Boating Skills And Seamanship 8 Copyright Coast Guard Auxiliary Association, Inc. Nautical Chart Features Harbor 1:2,000 1:40,000 Coast 1:40,000 1:150,000 General 1:150,000 1:600,000 Sailing 1:600,000 1:14,000,000 River Chart Strip Chart

9 Boating Skills And Seamanship 9 Copyright Coast Guard Auxiliary Association, Inc. Nautical Chart Features General Information Block Find the following on your General Information Block: Types of projection Scale Vertical and horizontal datums Reprinted with permission from How to Read A Nautical Chart by Nigel Calder

10 Boating Skills And Seamanship 10 Copyright Coast Guard Auxiliary Association, Inc. Vertical Datum Water Depth Mean Low Water Mean Lower Low Water Tide table adds or subtracts based on date & time Overhead clearance Based on Mean High Water

11 Boating Skills And Seamanship 11 Copyright Coast Guard Auxiliary Association, Inc. Chart Features/What Charts Show Locate on your charts the following information blocks: Principle landmarks Water depths Notes Shore details Aids to navigation Location, distance, and direction Compass Rose Lines of longitude Lines of latitude Reprinted with permission from The Weekend Navigator by Bob Sweet

12 Boating Skills And Seamanship 12 Copyright Coast Guard Auxiliary Association, Inc. Ship’s Compass Features Front reading Top or Back reading Fluxgate Digital Light for night Installation Lubbers line & keel Adjusting deviation Reprinted with permission from The Weekend Navigator by Bob Sweet

13 Boating Skills And Seamanship 13 Copyright Coast Guard Auxiliary Association, Inc. Fixing Your Position Great circles a flat plane that passes through the center of the earth Shortest route between two points on earth Grid pattern using lines of Latitude Longitude

14 Boating Skills And Seamanship 14 Copyright Coast Guard Auxiliary Association, Inc. Fixing Your Position Parallels of latitude North or South of equator Equator is great circle Parallels are small circles

15 Boating Skills And Seamanship 15 Copyright Coast Guard Auxiliary Association, Inc. Fixing Your Position Longitude lines West or East of Greenwich England Great circles passing through both poles

16 Boating Skills And Seamanship 16 Copyright Coast Guard Auxiliary Association, Inc. Fixing Your Position Locating a point on the chart Reprinted with permission from The Weekend Navigator by Bob Sweet

17 Boating Skills And Seamanship 17 Copyright Coast Guard Auxiliary Association, Inc. Fixing Your Position Distance on the earth’s surface Nautical mile Knot measures speed Use latitude scale to measure distance 1 degree latitude = 60 nm 1 minute latitude = 1 nm

18 Boating Skills And Seamanship 18 Copyright Coast Guard Auxiliary Association, Inc. Fixing Your Position Course Plotting Measuring direction Using course plotter Using parallel rulers Reprinted with permission from The Weekend Navigator by Bob Sweet

19 Boating Skills And Seamanship 19 Copyright Coast Guard Auxiliary Association, Inc. Sources of Compass Error Variation Polar north Magnetic north Annual change Compass Rose Deviation On board Magnetic Electro-magnetic Changes with boat heading Create table

20 Boating Skills And Seamanship 20 Copyright Coast Guard Auxiliary Association, Inc. Correcting a Compass Reading True(T) - westVariation(V)+ west Magnetic(M) + eastDeviation(D)- east Compass(C)

21 Boating Skills And Seamanship 21 Copyright Coast Guard Auxiliary Association, Inc. Finding Your Position Line of position (LOP) Range LOP Bearing LOP Loran time differential (TD) LOP Circle of position (COP) RADAR GPS

22 Boating Skills And Seamanship 22 Copyright Coast Guard Auxiliary Association, Inc. Finding Your Position Fix Where 2 LOP cross Where 2 COP cross Intersection of 2 distances 1 LOP & 1 distance Third value to validate

23 Boating Skills And Seamanship 23 Copyright Coast Guard Auxiliary Association, Inc. Finding Your Position Range LOPs Reprinted with permission from Boater’s Bowditch by Richard K. Hubbard

24 Boating Skills And Seamanship 24 Copyright Coast Guard Auxiliary Association, Inc. Finding Your Position Bearing LOPs

25 Boating Skills And Seamanship 25 Copyright Coast Guard Auxiliary Association, Inc. Finding Your Position Binocular 7 X 50 May have compass Reprinted with permission from The Weekend Navigator by Bob Sweet

26 Boating Skills And Seamanship 26 Copyright Coast Guard Auxiliary Association, Inc. Speed – Time – Distance

27 Boating Skills And Seamanship 27 Copyright Coast Guard Auxiliary Association, Inc. Primary Methods Of Navigation Dead Reckoning Piloting Celestial Navigation Electronic Navigation Inertial Guidance

28 Boating Skills And Seamanship 28 Copyright Coast Guard Auxiliary Association, Inc. Dead Reckoning Process of determining a ship’s approximate position by applying to the last well determined position, a series of vectors, representing the run that has since been made

29 Boating Skills And Seamanship 29 Copyright Coast Guard Auxiliary Association, Inc. Dead Reckoning

30 Boating Skills And Seamanship 30 Copyright Coast Guard Auxiliary Association, Inc. Piloting Near shore Landmarks visible for reference Still check water depth on chart

31 Boating Skills And Seamanship 31 Copyright Coast Guard Auxiliary Association, Inc. Electronic Navigation Loran GPS WAAS Electronic Charting RADAR Real time hazard identification Depth sounder

32 Boating Skills And Seamanship 32 Copyright Coast Guard Auxiliary Association, Inc. Electronic Navigation Waypoints Do NOT provide safe routes Verify all tracks on a chart for hazards

33 Boating Skills And Seamanship 33 Copyright Coast Guard Auxiliary Association, Inc. GPS Operation Reprinted with permission from Using GPS; A Captain’s Quick Guide by Bob Sweet Reprinted with permission from The Weekend Navigator by Bob Sweet Reprinted with permission from The Weekend Navigator by Bob Sweet

34 Boating Skills And Seamanship 34 Copyright Coast Guard Auxiliary Association, Inc. Tides Tides per day Diurnal Semi-diurnal Mixed Monthly Spring Tides Neap Tides

35 Boating Skills And Seamanship 35 Copyright Coast Guard Auxiliary Association, Inc. Tides Diurnal Semi-diurnal Mixed Reprinted with permission from The Weekend Navigator by Bob Sweet

36 Boating Skills And Seamanship 36 Copyright Coast Guard Auxiliary Association, Inc. Tide Tables Reprinted with permission from The Weekend Navigator by Bob Sweet

37 Boating Skills And Seamanship 37 Copyright Coast Guard Auxiliary Association, Inc.


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