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)

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

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

United States Power Squadrons ® Chart Smart ® USPS ® America's Boating Club ® 4 / 23 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

United States Power Squadrons ® Chart Smart ® USPS ® America's Boating Club ® 5 / 23 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

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

United States Power Squadrons ® Chart Smart ® USPS ® America's Boating Club ® 7 / 23 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

United States Power Squadrons ® Chart Smart ® USPS ® America's Boating Club ® 8 / 23 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

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

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

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

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

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

United States Power Squadrons ® Chart Smart ® USPS ® America's Boating Club ® 14 / 23 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

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

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

United States Power Squadrons ® Chart Smart ® USPS ® America's Boating Club ® 17 / 23 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 ° (2) Fl 8 sec 20ft Lt Ho on Channel Is ° (3) Fl Red 4 sec R "6" ° 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 ® 18 / 23

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

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

United States Power Squadrons ® Chart Smart ® USPS ® America's Boating Club ® 21 / 23 Position of Fix Latitude 41° 43.1 ' N Longitude 071° 19.7 ' W

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

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