INSTRUCTOR RECERTIFICATION 1 UNITED STATES POWER SQUADRONS ®
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Transcript of United States Power Squadrons ® Chart Smart ® USPS ® America's Boating Club ® 1 / 23 Welcome to...
United States Power Squadrons® Chart Smart®
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Welcome to the
United States Power Squadrons'
Chart Smart Seminar
Piloting - Determining Position(Section 7)
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Section 7: Piloting - Determining Position
• Dead Reckoning
• Class Plotting Exercises
Class Agenda - cont'd
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Definitions
Dead Reckoning (DR)• Calculating a boat's position based on its course, speed, and time run from a previous position
Dead Reckoning (DR) Track• The intended course line of a vessel as plotted
on a chart DR Position
• The presumed position of a vessel on a DR track
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• Must start from a known position
• Can only restart from known position
• Use only true courses for labeling
• Use only speed through the water
• Calculate and plot DR position hourly
• Plot DR position at time of every change of course and speed
Rules for Plotting “DR” Tracks
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Labeling a DR Track and Position
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Bearings
Magnetic Bearing
• Bearing taken using the compass
True Bearing
• Magnetic bearing corrected for local variation – East or West
• Can be plotted on a chart as a line of position
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T _____
V _____
M _____
D _____
C _____
303°
3° W
306°
0 °
306°
Add
East
Subtract
West
Deviation is assumed to be 0 for demonstration only
Compass to True Bearing
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* Note: deviation is assumed to be zero for demonstration only
North
Compass Direction - 055
A Bow-On Bearing
True Bearing "To" TB = 040
Variation V = 15 W
Magnetic Bearing MB = 055
Deviation * D = 0 W
Compass Bearing "To" CB = 055
Determining a Line of Position - as a graphical aid, plot the reciprocal true bearing (040 + 180 = 220) from the navigation object
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* Note: deviation determined from example Deviation Table displayed in Class #1; interpolated to 055°
North
Compass Direction - 055
A Bow-On Bearing
True Bearing "To" TB = 032
Variation V = 15 W
Magnetic Bearing MB = 047
Deviation * D = 8 W
Compass Bearing "To" CB = 055
Determining a Line of Position - as a graphical aid, plot the reciprocal true bearing (032 + 180 = 212) from the navigation object
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Fix By Two Bearings
1430
Note: 1430 fix time label is to be parallel to the bottom of the chart; 1430 DR time label is to be at an angle to the DR track.
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Mark at 303
Note: 1430 fix time label is to be parallel to the bottom of the chart; 1430 DR time label is to be at an angle to the DR track.
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Mark at 303
Note: 1430 fix time label is to be parallel to the bottom of the chart; 1430 DR time label is to be at an angle to the DR track.
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Use the Sample Plotting Sheet (Figure 23 in your text) to work through the problems starting on page 44 and continuing on page 45.
Class Exercise #5
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Positioning by Compass Bearings
on the
Bowditch Bay Practice Chart
Class Exercise #6 - Chart Work
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Bowditch Bay Chart Work Problem “6”
You are enroute from RG "D" Gong to R "6" and take bow–on compass bearings at 1320 on:
(1) Fl 8 sec 42ft Lt Ho on Duttons Is - 087 °(2) Fl 8 sec 20ft Lt Ho on Channel Is - 267 °(3) Fl Red 4 sec R "6" - 196 °
Correct the compass bearings to true bearings (assume deviation is zero)
Plot and label your bearings & fix on the chart and determine latitude and longitude.
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Compass to True Bearing
T = 072 ° T = 252 ° T = 181 °
V = 15 ° W V = 15 ° W V = 15 ° W
M = 087 ° M = 267 ° M = 196 °
D = 0 ° D = 0 ° D = 0 °
C = 087 ° C = 267 ° C = 196 °
Duttons Is Channel Is
Add
East
Subtract
West
R "6"
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FIX1320
252
1320
072
1320
181
1320
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Position of Fix
Latitude 41° 43.1 ' N
Longitude 071° 19.7 ' W
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End of Section 7
Piloting - Determining Position
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Questions ? … Comments ?
End of Seminar