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D-6 Chartwork Exercise

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  1. D-6 Chartwork Exercise

  2. Objectives The student will: • Apply the knowledge gained in Sections D-4 and D-5

  3. The Cruise - Departure You are aboard a friend’s 7m power cruiser, leaving Boutcher Bay on the north coast of CPS Island. By taking bearings on Summers Light and the nearby VHF tower, you have established your exact position as L 49º13.7’N, Lo 123º37.9’W.

  4. The Cruise - Destination An urgent radio message requires your friend to make a quick run to Seymour Landing on the south-east side of Bowen Island (L 49º20.5’N, Lo 123º21.2’W) and she asks you to act as navigator.

  5. The Boat The boat has a reliable steering compass with zero deviation, a hand-held bearing compass, a depth finder and a knotmeter but no electronic navigational aids. You plan to travel at a speed of 12 knots. Use a magnetic variation of 20ºE for this cruise.

  6. Pinpointing a Fixed Destination After studying the chart, you select Pt Cowan Lt (L 49º20.2’N, Lo 123º21.6’W) as your destination and carefully inspect the chart for hazards along the proposed route.

  7. Question 1 What hazards if any, lie within 2 miles of the track?

  8. Seymour Landing Boutcher Bay

  9. Draw the Track • Step One: Find the given latitude and longitude of the departure point on the chart and mark the point • Step Two: Draw a line from there to the black dot of the magenta symbol of Pt. Cowan Light

  10. Position Longitude: Lo 123º37.9’W 14’ 37’ 13’ Latitude: L 49º13.7’N

  11. Plotter Rose indicates a bearing of 059° C 059 S 12.0

  12. 019 ½° E We will use a magnetic variation of 20° E for this cruise

  13. Date: Vessel: Navigator: Time Obs Lat Long T V M D C Speed Dist. ETA Remarks 1205 FIX 49°13.7’N 123°37.9’W Depart for Point Cowan Lt. Log Entries

  14. Question 4 What is the course to steer by compass ? 039 0 039 059 20E

  15. Variation 20° East 039° Magnetic / 039 M C 059 S 12.0

  16. Question 5 What is the length of the track?

  17. Side Scale 1’ latitude = 1nm

  18. Answer to Question 5 12.4 nm / 039 M C 059 S 12.0

  19. Log Entries Date: Vessel: Navigator: Time Obs Lat Long T V M D C Speed Dist. ETA Remarks 1205 FIX 49°13.7’N 123°37.9’W Depart for Point Cowan Lt. 059 20E 039 0 039 12.0 12.4M

  20. Question 6 At a speed of 12.0 knots, what is the expected duration of the cruise? 60D = St 60 x 12.4 = t 12 5 x 12.4 = 62 minutes

  21. Question 7 How far will the boat travel in 10 minutes S x T D = 60 12.0 x 10 2 nm = = 60 You will travel 2.0 nm in 10 minutes

  22. Question 8 The boat travels one mile on a litre of fuel. There is no fuel supply at Seymour Landing and you plan to return to CPS Island. What is the minimum amount of fuel you should have on board? Minimum FUEL required is (1 mile / litre): 12.4 litres to Seymour Landing (1/3) 12.4 litres return (1/3) 12.4 litres reserve (1/3) 37.2 litres total (3 x 12.4)

  23. Question 9 If the light at Pt Cowan is partly obscured and is not visible for more than one mile, what other aids to navigation and/or landmarks might you use? Look for aids that will give you a good FIX as you approach Pt Cowan.

  24. / 039 M S 12.0 C 059 Other navigation and/or landmarks Cape Roger Curtis Light Cape Roger Curtis Light Microwave towers Microwave towers Port Atkinson Light Summers Light Summers Light Port Atkinson Light

  25. Plotting on the Chart You depart the Boutcher Bay Fix at 1205. Mark the 1210 DR position on the course line and others at 10-minute intervals thereafter.

  26. Depart & DRs 2.0 Miles 2.0 Miles 1300 2.0 Miles 1250 2.0 Miles 1240 2.0 Miles 1230 1220 / 039 M 1.0 Mile C 059 S 12.0 1210 1205

  27. Question 10 What is the ETA Pt Cowan Lt? From #6, cruise duration = 62 minutes ETA = 1205 + 62 (1 hour + 2 minutes) 1205 + 1hr + 2min = 1307 ETA = 1307

  28. Log Entries 1205 1307 ETA Point Cowan Lt. Date: Vessel: Navigator: Time Obs Lat Long T V M D C Speed Dist. ETA Remarks 1205 FIX 49°13.7’N 123°37.9’W 059 20E 039 0 039 12.0 12.4M Depart for Point Cowan Lt.

  29. T V M D C Question 11 At 1225, Summers Light bears 231ºM by hand-bearing compass. Are you on track, right of track or left of track? 251 20E 231

  30. 1230 1220 C 059 / 039 M S 12.0 1210 1205 Summers Light bears 231° Magnetic Rotate Plotter Rose to 251° 231° Magnetic Right of Track 251° 231° Magnetic 1225 / 231 M 251 Variation 20° East

  31. Log Entries 1205 ETA Point Cowan Lt. 1225 Brg 251 20E 231 0 231 Summers Lt. Date: Vessel: Navigator: Time Obs Lat Long T V M D C Speed Dist. ETA Remarks 1205 FIX 49°13.7’N 123°37.9’W 059 20E 039 0 039 12.0 12.4M Depart for Point Cowan Lt.

  32. Plotting and Labeling At 1253, Cape Roger Curtis Lt bears 304º M by hand-bearing compass and Pt Atkinson Lt bears 040º M by hand-bearing compass. Plot and label the 1253 LOPs and the 1253 FIX.

  33. T V M D C Step 1: Convert to TRUE Cape Roger Curtis Lt 324 20E 304 Pt Atkinson Lt 20E 040 060

  34. 1300 1250 1240 Cape Roger Curtis Light bears 304° Magnetic 324° Rotate Plotter Rose to 324° 304° Magnetic 304° Magnetic Variation 20° East 324 / 304 M

  35. 1300 1250 1240 Point Atkinson Light bears 040° Magnetic Rotate Plotter Rose to 060° 040° Magnetic Variation 20° East 324 / 040 M 040° Magnetic 060 / 304 M 060°

  36. Log Entries 1225 Brg 251 20E 231 0 231 Summers Lt. 1253 Brg1 324 20E 304 0 304 Cape Roger Curtis Lt. 1253 Brg2 060 20E 040 0 040 Pt. Atkinson Lt

  37. 1300 1250 1240 1253 FIX L49°17.3’N Lo123°22.5’W 324 / 040 M 060 / 304 M 1253

  38. Speed Made Good 60 x D 60 x 10.6 13.25 S = = = T 48.0 13.3 SMG between 1205 & 1253 is 13.3 knots 1300 324 1250 / 304 M 10.6 nm 1253 1240 1230 050° Magnetic / 050 M CMG 070 1220 SMG 13.3 / 039 M C 059 S 12.0 1210 070° 1205

  39. Log Entries 1225 Brg 251 20E 231 0 231 Summers Lt. 1253 Brg1 324 20E 304 0 304 Cape Roger Curtis Lt. 1253 Brg2 060 20E 040 0 040 Pt. Atkinson Lt 1253 FIX 49°17.3’N 123°22.5’w Distance travelled since 1205 10.6M, SMG 13.3 kn

  40. Question 15 From the 1253 fix, what is the true course to reach Point Cowan Light?

  41. 1300 1250 1240 New Course 352° Magnetic / 352 M S 12 324 / 040 M C 012 060 / 304 M 012° 1253 / 050 M CMG 070 SMG 13.3

  42. T V M D C Question 16 What is the corresponding compass course to steer? 012 20E 352 0 352

  43. Question 17 At 1253, how far are you from Point Cowan Light? 2.9 nautical miles 2.9 nm

  44. Log Entries 1225 Brg 251 20E 231 0 231 Summers Lt. 1253 Brg1 324 20E 304 0 304 Cape Roger Curtis Lt. 1253 Brg2 060 20E 040 0 040 Pt. Atkinson Lt 1253 FIX 49°17.3’N 123°22.5’w Distance travelled since 1205 10.6M, SMG 13.3 kn 1253 012 20E 352 0 352 12.0 2.9M Change course

  45. 60 x D 60 x 2.9 13.1 min t = = = S 13.3 Question 18 & 19 Assuming the same Speed Made Good, how long will it take you to reach Pt Cowan Light? What is the new ETA at Pt Cowan Light? 13 minutes 1253 + 13 minutes = 1306 ETA

  46. Log Entries 1225 Brg 251 20E 231 0 231 Summers Lt. 1253 Brg1 324 20E 304 0 304 Cape Roger Curtis Lt. 1253 Brg2 060 20E 040 0 040 Pt. Atkinson Lt 1253 FIX 49°17.3’N 123°22.5’w Distance travelled since 1205 10.6M, SMG 13.3 kn 1253 012 20E 352 0 352 12.0 2.9M Change course 1253 1306 ETA Point Cowan Lt.

  47. Arrival You pass Point Cowan Light close aboard exactly at the time calculated.

  48. Log Entries 1225 Brg 251 20E 231 0 231 Summers Lt. 1253 Brg1 324 20E 304 0 304 Cape Roger Curtis Lt. 1253 Brg2 060 20E 040 0 040 Pt. Atkinson Lt 1253 FIX 49°17.3’N 123°22.5’w Distance travelled since 1205 10.6M, SMG 13.3 kn 1253 012 20E 352 0 352 12.0 2.9M Change course 1253 1306 ETA Point Cowan Lt. 1306 FIX Close aboard Point Cowan Lt.

  49. Docked At 1315, you dock at Seymour Landing.

  50. 1225 Brg 251 20E 231 0 231 Summers Lt. 1253 Brg1 324 20E 304 0 304 Cape Roger Curtis Lt. 1253 Brg2 060 20E 040 0 040 Pt. Atkinson Lt 1253 FIX 49°17.3’N 123°22.5’w Distance travelled since 1205 10.6M, SMG 13.3 kn 1253 012 20E 352 0 352 12.0 2.9M Change course 1253 1306 ETA Point Cowan Lt. 1306 FIX Close aboard Point Cowan Lt. 1315 Arrive Seymour Landing Log Entries