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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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22USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
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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33USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
090
270
180
000
080070
060050
040
030020
01000
0
260 250240
230
220210
209190
180
100110
120
130
140
150
160
170
180
280290
300
310
320
330
340
350
360
170 160150
140
130
350 340 330320
310
190200
210
220
230
010020
030
040
050
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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44USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
Various Styles of DividersVarious Styles of Dividers
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55USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
A Chart Compass RoseA Chart Compass Rose
Variation is found in the center of the compass rose
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66USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
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>>>>
77USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
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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88USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
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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99USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
Bowditch Bay Practice ChartBowditch Bay Practice Chart
G G C "1"C "1"
RG "D"RG "D"
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1010USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
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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090
270
180
000
080 070 060 050040
030
020
010000
260 250 240 230220
210
209190
180
100
110
120
130
140
150
160
170
180
280
290
300
310
320
330
340
350
360
170 160 150 140130
350 340 330 320 310190
200
210
220
230
010
020
030
040
050
1111USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
Bowditch Bay Practice ChartBowditch Bay Practice Chart
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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090
270
180
000
080 070 060 050040
030020
010000
260 250 240 230220
210209
190180
100
110
120
130
140
150
160
170
180
280
290
300
310
320
330
340
350
360
170 160 150 140130
350 340 330 320 310190
200
210
220
230
010
020
030
040
050
1212USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
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
1313USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
Plotting ToolsPlotting Tools
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Straight edge course line
000°
090°
180°
270°
090
270
180
000
080 070 060 050040
030
020010
000
260 250 240 230 220210
209190
180
100
110
120
130
140
150
160
170
180
280
290
300
310
320
330
340
350
360
170 160 150 140 130350340330320310190
200
210
220
230
010
020
030
040
050
1414USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
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
090
270
180
000
080 070 060 050040
030
020010
000
260 250 240 230 220210
209190
180
100
110
120
130
140
150
160
170
180
280
290
300
310
320
330
340
350
360
170 160 150 140 130350340330320310190
200
210
220
230
010
020
030
040
050
070
250
160
0670
320
240260
Read 067º on outer scales
(scales read right to left)
1515USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
Using Latitude Grid LineUsing Latitude Grid Line
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Starting Waypoint
Destination Waypoint
Slide straight edge along course line
align bulls-eye with grid line
090
270
180
000
080 070 060 050040
030
020010
000
260 250 240 230 220210
209190
180
100
110
120
130
140
150
160
170
180
280
290
300
310
320
330
340
350
360
170 160 150 140 130350340330320310190
200
210
220
230
010
020
030
040
050
Read 157º / 337º on outer scales
(scales read right to left)
Latitude Grid Line Yields
Wrong Quadrant
160
340
1570
330
350
1616USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
Using Latitude Grid LineUsing Latitude Grid Line
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Slide straight edge along course line
align bulls-eye with grid line
090270
180000
080070
06005
0040
030020
010
000
260250
24023
0220
210209
190
180
100
110
120130140150
160
170
180
280
290
300310320330
340
350
360
170160
15014
0130
35034033032
0310
190
200210
220230
010
020030
040050
Read 140º / 320º on inner scales
(scales read right to left)
EXAMPLE 2
(new course)
Latitude Grid Line Yields
Proper
Quadrant
Starting Waypoint
Destination Waypoint
05004
230
140
70
320
220240
130150
1717USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
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
1818USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
Bowditch Bay Practice ChartBowditch Bay Practice Chart
C067
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1919USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
Class ExerciseClass Exercise
Using Maptech’s Chart Navigator “A2B” function, determine the reciprocal course in the prior exercise.
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2020USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
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’
2121USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
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
2222USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
Bowditch Bay Practice ChartBowditch Bay Practice Chart
C247
>>>>
2323USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
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
º
090
270
180
000
080070 060 050 040
030020
010000
260 250 240 230 220 210209
190180
100
110
120
130
140
150
160
280
290
300
310
320
330
340
170 160 150 140 130
350340 330320 310
190
200
210
220
230
010
020
030
040
050
060
240
150
0570
330
230250
2424USPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more funUSPS - dedicated to making boating safer and more fun
ENDEND
Section 7Section 7
United States Power Squadrons® United States Power Squadrons® Boating CourseBoating Course