United States Power Squadrons ® Chart Smart ® USPS ® America's Boating Club ® 1 / 23 Welcome to...

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United States Power Squadrons ® Chart Smart ® USPS ® America's Boating Club ® 1 / 23 Welcome to the United States Power Squadrons' Chart Smart Seminar Piloting - Determining Position (Section 7)

Transcript of United States Power Squadrons ® Chart Smart ® USPS ® America's Boating Club ® 1 / 23 Welcome to...

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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