United States Power Squadrons Chart Smart Welcome to

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

United States Power Squadrons® Chart Smart® Class Agenda - cont'd q Section 7: Piloting - Determining Position • Dead Reckoning • Class Plotting Exercises USPS ® America's Boating Club ® 2 / 23

United States Power Squadrons® Chart Smart® ���� USPS ® America's Boating Club ® 3 / 23

United States Power Squadrons® Chart Smart® Definitions q Dead Reckoning (DR) • Calculating a boat's position based on its course, speed, and time run from a previous position q Dead Reckoning (DR) Track • The intended course line of a vessel as plotted on a chart q DR Position • The presumed position of a vessel on a DR track USPS ® America's Boating Club ® 4 / 23

United States Power Squadrons® Chart Smart® Rules for Plotting “DR” Tracks • 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 USPS ® America's Boating Club ® 5 / 23

United States Power Squadrons® Chart Smart® Labeling a DR Track and Position USPS ® America's Boating Club ® 6 / 23

United States Power Squadrons® Chart Smart® Bearings q Magnetic Bearing • Bearing taken using the compass q True Bearing • Magnetic bearing corrected for local variation – East or West • Can be plotted on a chart as a line of position USPS ® America's Boating Club ® 7 / 23

United States Power Squadrons® Chart Smart® Compass to True Bearing T 303° _____ V 3° W _____ M 306° _____ D _____ 0° C 306° _____ Add East Subtract West Deviation is assumed to be 0 ° for demonstration only USPS ® America's Boating Club ® 8 / 23

United States Power Squadrons® Chart Smart® A Bow-On Bearing North True Bearing "To" Variation Magnetic Bearing Deviation * Compass Bearing "To" TB = 040 V = 15 W MB = 055 D = 0 W CB = 055 Compass Direction - 055 Determining a Line of Position - as a graphical aid, plot the reciprocal true bearing (040 + 180 = 220) from the navigation object * Note: deviation is assumed to be zero for demonstration only USPS ® America's Boating Club ® 9 / 23

United States Power Squadrons® Chart Smart® A Bow-On Bearing North Compass Direction - 055 Determining a Line of Position - as a graphical aid, plot the reciprocal true bearing (032 + 180 = 212) from the navigation object * Note: deviation determined from example Deviation Table displayed in Class #1; interpolated to 055° USPS ® America's Boating Club ® 10 / 23

United States Power Squadrons® Chart Smart® 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. USPS ® America's Boating Club ® 11 / 23

United States Power Squadrons® Chart Smart® 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. USPS ® America's Boating Club ® 12 / 23

United States Power Squadrons® Chart Smart® 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. USPS ® America's Boating Club ® 13 / 23

United States Power Squadrons® Chart Smart® Class Exercise #5 Use the Sample Plotting Sheet (Figure 23 in your text) to work through the problems starting on page 44 and continuing on page 45. USPS ® America's Boating Club ® 14 / 23

United States Power Squadrons® USPS ® America's Boating Club ® Chart Smart® 15 / 23

United States Power Squadrons® Chart Smart® Class Exercise #6 - Chart Work Positioning by Compass Bearings on the Bowditch Bay Practice Chart USPS ® America's Boating Club ® 16 / 23

United States Power Squadrons® Chart Smart® 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 42 ft Lt Ho on Duttons Is - 087 ° (2) Fl 8 sec 20 ft 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. USPS ® America's Boating Club ® 17 / 23

United States Power Squadrons® USPS ® America's Boating Club ® Chart Smart® 18 / 23

United States Power Squadrons® Chart Smart® Compass to True Bearing Duttons Is Channel Is R "6" T = 072 ° T = 252 ° T = 181 ° V = 15 ° W M = 087 ° M = 267 ° M = 196 ° D= D= D= 0° C = 087 ° USPS ® America's Boating Club ® 0° C = 267 ° 0° Add East Subtract West C = 196 ° 19 / 23

United States Power Squadrons® USPS ® America's Boating Club ® 1320 072 1320 181 1320 252 Chart Smart® FIX 20 / 23

United States Power Squadrons® Chart Smart® Position of Fix Latitude 41° 43. 1 ' N Longitude 071° 19. 7 ' W USPS ® America's Boating Club ® 21 / 23

United States Power Squadrons® Chart Smart® End of Section 7 Piloting - Determining Position USPS ® America's Boating Club ® 22 / 23

United States Power Squadrons® Chart Smart® Questions ? … Comments ? End of Seminar USPS ® America's Boating Club ® 23 / 23