USPS - dedicated to making boating safer and more fun 1 Section 7 Piloting – Plotting a Course...

11USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun

Section 7Section 7

Piloting – Plotting a CoursePiloting – Plotting a Course

Version 5.0 - 1/2006Version 5.0 - 1/2006

United States Power SquadronsUnited States Power Squadrons®® Boating CourseBoating Course

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DefinitionsDefinitions

NavigationNavigation The science of moving a boat in a The science of moving a boat in a

safe and efficient manner.safe and efficient manner.

PilotingPiloting A part of navigation using landmarks, A part of navigation using landmarks,

navigational aids, and soundings as navigational aids, and soundings as primary tools.primary tools.

You will need a chart, a compass and plotting toolsYou will need a chart, a compass and plotting tools

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Rectangular Course Plotter

Used throughout USPS courses

1. 4x15 Transparent base

2. Parallel lines for alignment

3. Protractor scale for measurement

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Various Styles of DividersVarious Styles of Dividers

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A Chart Compass RoseA Chart Compass Rose

Variation is found in the center of the compass rose

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Why Rules for Chart Work?Why Rules for Chart Work?

Good habits will reduce errorsGood habits will reduce errors

Mistakes are easier to findMistakes are easier to find

Information is clear for future Information is clear for future

useuse

Other boaters can follow your Other boaters can follow your

workwork

You know you are in You know you are in Safe WaterSafe Water>>>>


Accuracy StandardsAccuracy Standards

AngleAngle - - Nearest Whole Degree Nearest Whole Degree - 214 º- 214 º

DistanceDistance - - Nearest 1/10 of a mile Nearest 1/10 of a mile - 6.5 - 6.5 nmnm

SpeedSpeed - - Nearest 1/10 of a knot Nearest 1/10 of a knot - 4.3 kn- 4.3 kn

TimeTime - - Nearest whole minute Nearest whole minute - 1343 - 1343

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Class ExerciseClass Exercise

On the Bowditch Bay chart, plot a On the Bowditch Bay chart, plot a course:course:

From: G “C 1” off Chapman PointFrom: G “C 1” off Chapman Point

To: RG “D” Gong on the upper right To: RG “D” Gong on the upper right side of the chartside of the chart

Plot a Course:

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Bowditch Bay Practice ChartBowditch Bay Practice Chart

G G C "1"C "1"

RG "D"RG "D"

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How ToHow ToDraw A Course Line UsingDraw A Course Line Using

C "1"C "1"

RG "D"RG "D"

Bowditch Bay Chart

The Course PlotterThe Course Plotter

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Lay edge of the Course

Plotter between the two

nav aids

1

2 Using the Course Plotter

as a straight edge, draw

the course line

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How ToHow ToDetermine Course Heading UsingDetermine Course Heading Using

The Course PlotterThe Course Plotter

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Two MethodsTwo Methods

Using Plotter & Latitude grid linesUsing Plotter & Latitude grid lines

Using Plotter & Longitude grid linesUsing Plotter & Longitude grid lines


Plotting ToolsPlotting Tools

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Straight edge course line

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Using Longitude Grid LineUsing Longitude Grid Line

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Starting Waypoint

Destination Waypoint

Slide straight edge along course line

align bulls-eye with grid line

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Read 067º on outer scales

(scales read right to left)


Using Latitude Grid LineUsing Latitude Grid Line

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Starting Waypoint




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Read 157º / 337º on outer scales


Latitude Grid Line Yields

Wrong Quadrant

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Using Latitude Grid LineUsing Latitude Grid Line

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090270

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Read 140º / 320º on inner scales


EXAMPLE 2

(new course)

Latitude Grid Line Yields

Proper

Quadrant

Starting Waypoint


05004

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Labeling A Course Line Labeling A Course Line

Place the true course direction near the beginning of the course

Course 067° true

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C "1"C "1"

RG "D"RG "D"

C 067C 067



C067

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Class ExerciseClass Exercise

Using Maptech’s Chart Navigator “A2B” function, determine the reciprocal course in the prior exercise.

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Determine the CourseDetermine the Coursevia Chart Navigatorvia Chart Navigator

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A B

1. Select A2B Tool 2. Move cursor to 1st waypoint, click

A

3. Move cursor to 2nd waypoint, click

B

4. Cursor over 1st or 2nd waypoint, right click

Name: (date created or user assigned)

Properties Delete

Name: (date created or user assigned)

Properties Delete

5. Click ‘Properties’


Labeling A Course Line Labeling A Course Line

reciprocalreciprocal

067067180180247247

Place the true course direction near the beginning of the course

Course 247° true

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C "1"C "1"

RG "D"RG "D"

C 247C 247



C247

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ConclusionConclusion

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1. Estimate the course (at least to 0-90, 90-180, etc).

2. Put a pencil or divider tip on one of the course points.

3. Bring the top edge of the plotter around so it goes between the two points.

4. Slide the plotter along the course line until the plotter bullseye is on a horizontal or vertical grid line. (Having the pencil or divider on one of the course points makes it easier to slide the plotter while keeping it aligned with the course line.)

5. Look at the four possible course readings, pick the one that fits your estimate of the course. (this, along with step 1, eliminates the need for remembering whether the inner graduations are for use with a meridian or parallel)

0º-0

90º

090º-180º

270º-360º

180º

-270

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ENDEND

Section 7Section 7

United States Power Squadrons® United States Power Squadrons® Boating CourseBoating Course

USPS - dedicated to making boating safer and more fun 1 Section 7 Piloting – Plotting a Course...

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