1. Advanced Piloting Course (Coastal Navigation) Chapter 10 Review Educational Officer – Dave West dwest@voyager.net - 651-429-3840 Assistant Educational Officer – David Moberg davidmoberg@att.net – 715-386-8582 Instructor – Art Mollica artmollica@usfamily.net - 651-777-0277 United States Power Squadrons ®

2. 2 APPENDIX A - WEEKEND CRUISE PART 5

3. 3 x x x x x 1101 M0M0 1106 GPS x 1151 GPS C 129M S 7.0 1213 1228 1228 D 1.9 1151 GPS 1300 C 020M S 10.0 1400 1420 GPS Set 253M Dft 2.1 COG 009M SOG 8.7 25) At 1400 you decide not to raft up with your friend. You leave “1” BELL at the entrance to Menemsha Basin and lay a course for BR C southwest of Lucas Shoal. Your speed is 10kn. Your GPS indicates a bearing of 020ºM. The wind has changed direction and is coming from the northeast and has increased in strength causing whitecaps in Vineyard Sound. You are having trouble holding the course. You suspect there is a current causing your boat to drift towards the southwest. At 1420 you can see the BR C to the northeast and you decide to stop and get a GPS Fix and calculate your set and drift. The 1420 GPS Fix position is L 41º24.3’N and Lo 70º46.7’W. 1420 WptPan DBG29 VSRWNA QKHG1 VSBR MPG1 BBRR SPRR2

4. 4 x x x x x 1101 M0M0 1106 GPS x 1151 GPS C 129M S 7.0 1213 1228 1228 D 1.9 1151 GPS 1300 C 020M S 10.0 1400 1420 GPS Set 253M Dft 2.1 COG 009M SOG 8.7 25) At 1400 you decide not to raft up with your friend. You leave “1” BELL at the entrance to Menemsha Basin and lay a course for BR C southwest of Lucas Shoal. Your speed is 10kn. Your GPS indicates a bearing of 020ºM. The wind has changed direction and is coming from the northeast and has increased in strength causing whitecaps in Vineyard Sound. You are having trouble holding the course. You suspect there is a current causing your boat to drift towards the southwest. At 1420 you can see the BR C to the northeast and you decide to stop and get a GPS Fix and calculate your set and drift. The 1420 GPS Fix position is L 41º24.3’N and Lo 70º46.7’W. 1420 25a) Calculate the set and drift at 1420. 25b) Why is your drift more than calculated? 25c) What is your speed over ground? 25d) What is your course over ground? VSBR QKHG1 VSRWNA DBG29 1

5. 5 x x x x x 1101 M0M0 x 1151 GPS C 129M S 7.0 1213 1228 1228 D 1.9 1151 GPS 1300 C 020M S 10.0 1400 1420 GPS Set 253M Dft 2.1 COG 009M SOG 8.7 1420 C 018M S 10.0 XTE 0.2 1435 GPS 1447 Visual 1447 Course T = 256ºW V = 015ºW M = 271º 26) You take another GPS fix at 1435 L 41º 24.2’ N and Lo 70º 47.0’ W and continue towards R “28” Fl R 4sec BELL from the 1435 fix. Using the GPS cross track error (XTE) feature you stay within 0.25nm of your course. When you arrive at buoy R “28” Fl R 4sec BELL at your planned time of 1447 you make a decision to go to Buzzards Bay through Quicks Hole. You continue on a course to the buoy south of Quicks Hole and arrive at G “1” Fl G 4sec BELL at 1503. Speed is 10kn. What is the set and current strength at the middle portion of Quicks Hole at 1503? Use reference station Cape Cod Canal. C 271M S 10.0 WptPan 1106 GPS 1435 Course T = 003ºW V = 015ºW M = 018º QKHG1 BBRR VSRWNA MPG1 SPRR2 BBG7 VSBR VSR28 1503 Visual

6. 6 x x x x x 1101 M0M0 1106 GPS x 1151 GPS C 129M S 7.0 1213 1228 1228 D 1.9 1151 GPS 1300 C 020M S 10.0 1400 1420 GPS Set 253M Dft 2.1 COG 009M SOG 8.7 1420 C 018M S 10.0 XTE 0.2 1435 GPS 1447 Visual C 271M S 10.0 1503 Visual VSRWNA QKHG1 VSR28 VSBR MPG1 DBG29

7. 7 C 271M S 10.0 C 066M S 13.0 27a) T = 051ºW V = 015ºW M = 066º 27b) T= 60D/S T= 60x6.4/13 T= 384/13 T= 29.5/30 min 1521 + 0030 ETA 1551 27c) T= 60D/S T= 60x3.5/13 T= 210/13 T= 16.2/16 min 1551 + 0016 ETA 1607 27c) Course T = 077ºW V = 015ºW M = 092º C 092M S 13.0 D 1.8 1058 C 252M S 13 1020 C 272M S 13.0 1027 182M 1027 QKHG1 BBR8 BBBB BBR8 BBG13 QHR2 1503 Visual 1521 BBG7 QKHBR C 000M S 10.0 27) You arrive at Lone Rock BR 1 Qk Fl G at 1521 and change your course to a pre-determined GPS position of L 41º 31.8’ N and Lo 70º 44.5’ W northwest of Weepecket Island in 45’ of water. Speed is 13kn. 27a) What is the True course to the GPS WPT? 051º 27b) What is your ETA at the GPS WPT? 1551 27c) Plot and label final leg of cruise to R “2” Fl R 4sec at entrance to Quissett Harbor. ETA at R “2” 1607

8. 8 APPENDIX A - WEEKEND CRUISE FINISHED

9. Slide 9

10. Slide 10 Questions ? … Comments

11. Vectors have both speed and direction C105M S 5.0 1000 DR Course = course steered & boat speed At 1000 you depart position A on a true course of 090º with a boat speed of 5.0 knots. T-V-M = 090 +15 = 105ºM At 1050 your GPS position is B vs. DR position of C D = ST/60 = D = 5.0 x 50 / 60 = 4.16 = 4.2nm A 1050 1050 GPS B Current = direction of flow (set) & speed of current (drift) Distance from C to B divided by lapsed time is drift Dft = 60D/T = Dft = 60 x 2.0 / 50 = 2.4kts and direction from C to B is set. C Actual Course = course over ground and speed over ground Distance from A to B divided by lapsed time is speed over ground SOG=60D/T = SOG = 60 x 3.1 / 50 = 3.72 = 3.7kts and direction from A to B is course over ground Set 240M Dft 2.4 COG131M SOG 3.7 2.0nm 3.1nm

12. Using known set & drift to determine compass course/course to steer At 1050 you depart position A for buoy at B with speed of 8.0 knots. Plot know Current effect = 2.4nm in 1 hour at 225º = starting point C Swing arc 8.0nm long from C to cross DR course line at D Direction from C to D is course to steer T – V – M = 144 + 15 = 159ºM Replot & label this line from A to determine course is safe should current/drift change. Distance from A to D is speed = 8.9nm = 8.9kts ETA at B T=60D/S = T = 60 x 7 / 8.9 = 47.19 = 47min 1050 + 47 = 1137 AB C105M S 5.0 1000 1050 1050 GPS Set 240M Dft 2.4 COG131M SOG 3.7 COG175M SOG 8.9 Set 240M Dft 2.4 CD C159M S 8.0

13. WP01 – buoy R N “2” near entrance to Blackfish CreekWP02 – buoy R N “2” near entrance to Shark River WP03 – Latitude N41º 44.0’; Longitude W71º 51.0’WP04 – buoy RG “D” Fl (2+1) R GONG WP05 – buoy R N “2” near entrance to Perkings Cove WP06 – center of compass rose WP07 – Latitude N41º 38.3’, Longitude W71º 46.5’ WP01 WP02 WP03 WP04 WP05 WP06 WP07

14. Plot and label your intended route, Leg 1 WP01 to WP02; Leg 2 WP02 to WP03; Leg 3 WP03 to WP04; and Leg 4 WP04 to WP05. 1) What is the total distance of your intended route? 2) What will be the initial compass heading from WP01 to WP02? WP01 WP02 WP03 WP04 WP05 WP06 WP07 C 355M C 102M C 061M C 174M D 10.9 D 6.3 D 3.5 D 8.9

15. Using WP07, what is the distance for the danger circle that will encompass the rocks near buoy G “5” Fl G 4sec GONG? Plot and label a crosstrack error along the first leg that will keep you clear of the rocks southwest of Channel Island. WP01 WP02 WP03 WP04 WP05 WP06 WP07 C 355M C 102M C 061M C 174M D 10.9 D 6.3 D 3.5 D 8.9 NLT 0.8 XTE 1.1 Stbd

16. Your intentions are to met friends for a raft-up and lunch at WP02. You need to determine the latest time on Saturday you can transit beneath the Tarr Bridge, a fixed span with a charted clearance of 35 feet above MHW and a charted depth of 10 feet at MLLW. For safety reasons, you want at least 38 foot of clearance. You will use the enclosed excerpts from the Bowditch Bay Tide & Current Tables for these calculations. Reference station is Perkins Cove West Jetty.

17. Tarr Bridge 3 Perkins Cove West Jetty 4 Jul 0548 H 1148 L 9.0 0.4 0009 H 0005 L 0.95 1.00 0557 H 1153 L 8.6 0.4 2336 L -0.30005 L 1.002341 L-0.3 8.68.9 35 386.4 9.4 6.4 -0.3 6.7 75 23 3604 0003 24

18. You set your sails and at 0830 you pass close-abeam of WP01 on a starboard tack at 4.0kn. As is your practice, you plot your GPS position approximate every hour. Your times and positions along Leg 1 are: 09:27:40 L 41º 36.989’N Lo 71º 55.000’W; 10:30:15 L 41º 38.320’N Lo 71º 58.004’W; 11:30:12 L 41º 40.686’N Lo 71º 56.732’W; 12:26:18 L 41º 42.116’N Lo 71º 59.007’W. Plot and label each position. WP01 WP02 WP03 WP04 WP05 WP06 WP07 C 355M C 102M C 061M C 174M D 10.9 D 6.3 D 3.5 D 8.9 NLT 0.8 XTE 1.1 Stbd 0928 GPS 1030 GPS 1130 GPS 1226 GPS 0830 Visual

19. At 1230 you receive a VHF call from your friends advising you that they have anchored at position N41º 45.000’, W71º 59.960’. You start your auxiliary engine and make preparation to change course to join your friends. Remembering that practice is the only way to maintain your skills, you decide to plot your position using your radar. You note two distinctive radar returns at 1235 and identify them as buoys R N “2” at a range of 1.3nm and G C “1” at a range of 1.2nm. Plot your position and course to your friends. WP01 WP02 WP03 WP04 WP05 WP06 WP07 C 355M C 102M C 061M C 174M D 10.9 D 6.3 D 3.5 D 8.9 NLT 0.8 XTE 1.1 Stbd 0928 GPS 1030 GPS 1130 GPS 1226 GPS 0830 Visual WP08 1235 Radar D 1.3 D 1.2 C 012M

20. You arrive at 1310 and raft-up. While discussing the morning’s cruise, you decide to determine your course and speed made good to your 1235 fix. What is your course made good? What is your speed made good? WP01 WP02 WP03 WP04 WP05 WP06 WP07 C 355M C 102M C 061M C 174M D 10.9 D 6.3 D 3.5 D 8.9 NLT 0.8 XTE 1.1 Stbd 0928 GPS 1030 GPS 1130 GPS 1226 GPS 0830 Visual WP08 1235 Radar D 1.3 D 1.2 C 012M 1310 D = 7.8nm, T = 245minS = (60 x 7.8) / 245S = 1.91 = 1.9

21. You depart at 1400 for WP08 using your auxiliary engine at a speed of 6.0 kn. At 1445 you note the beacon on Channel Island abeam to starboard. Plot and label this position. You continue to WP03, arriving at 1530. As the predicted rain clouds are beginning to form you decide to abandon your plan and head directly for Perkins Cove. From past experience, you know the current along the intended route can greatly affect your course. You cut your engine and drift while you determine the new course. WP01 WP02 WP03 WP04 WP05 WP06 WP07 C 355M C 102M C 061M C 174M D 10.9 D 6.3 D 3.5 D 8.9 NLT 0.8 XTE 1.1 Stbd 0928 GPS 1030 GPS 1130 GPS 1226 GPS 0830 Visual WP08 1235 Radar D 1.3 D 1.2 C 012M 1310 1400 C 113M S 6.0 1445 203M 1445 1530

22. You will use the enclosed excerpts from the Bowditch Bay Tide & Current Tables for these calculations. Reference station is Perkins Cove. What is the current set & drift at 1545?

23. Tarr Bridge 3 Perkins Cove West Jetty 4 Jul 184 1545 1302 0009 1311 1643 F 1.2 00181.917012.3 19260039 2005 1302 1643 0341 221 77 1302141915361643 90 184F 2.32.0

24. Assume your speed made good from your 1400 position to WP03 will be your speed to WP05. From your 1530 position, what is your course to steer for WP05, taking into account your predicted current. WP01 WP02 WP03 WP04 WP05 WP06 WP07 C 355M C 102M C 061M C 174M D 10.9 D 6.3 D 3.5 D 8.9 NLT 0.8 XTE 1.1 Stbd 0928 GPS 1030 GPS 1130 GPS 1226 GPS 0830 Visual WP08 1235 Radar D 1.3 D 1.2 C 012M 1310 1400 C 113M S 6.0 1445 203M 1445 1530 COG 155M SOG 5.0 D = 6.7, T = 90min S = (60x6.7) / 90 S = 4.46 = 4.5 kn C 147M S 4.5 Set 2.0 Drf199M