Welcome to the United States Power Squadrons' Chart Smart Seminar

Section 5 - Piloting - Plotting a CourseUSPS ® America's Boating Club ®
USPS ® America's Boating Club ®
Dead Reckoning
USPS ® America's Boating Club ®
USPS ® America's Boating Club ®
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
United States Power Squadrons® Chart Smart®
USPS ® America's Boating Club ®
Plot DR position at time of every change
of course and speed
United States Power Squadrons® Chart Smart®
USPS ® America's Boating Club ®
USPS ® America's Boating Club ®
True Bearing
Can be plotted on a chart as a line
of position
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Compass to True Bearing
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* Note: deviation is assumed to be zero for demonstration only
North
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
Determining a Line of Position - as a graphical aid, plot the reciprocal true bearing (032 + 180 = 212) from the navigation object
49.unknown
USPS ® America's Boating Club ®
Fix By Two Bearings
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.
1430
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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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USPS ® America's Boating Club ®
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
USPS ® America's Boating Club ®
USPS ® America's Boating Club ®
United States Power Squadrons® Chart Smart®
USPS ® America's Boating Club ®
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.
United States Power Squadrons® Chart Smart®
USPS ® America's Boating Club ®
USPS ® America's Boating Club ®
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
USPS ® America's Boating Club ®
USPS ® America's Boating Club ®
USPS ® America's Boating Club ®
USPS ® America's Boating Club ®