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Worksheet 646 · Skill 6

Course to steer

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  1. You are at 156°T, 1.7 nm from Westfield church spire, bound for Green can "3". Your speed through the water is 5.9 kn. The current sets 231°T at 1.3 kn.

    Find the true course to steer that keeps you on the straight track to the buoy, your speed over the ground, and how many minutes it will take.

    Tolerance: 3° (the track is measured on the chart), 0.3 kn and 3 minutes (or 5 %).

    Course to steer: ________ °T   Speed over the ground: ________ kn   Time to the mark: ________ min  

  2. You are at 314°T, 3.3 nm from Tern Island tower, bound for Green can "3". Your speed through the water is 9.8 kn. The current sets 333°T at 2.2 kn.

    Find the true course to steer that keeps you on the straight track to the buoy, your speed over the ground, and how many minutes it will take.

    Tolerance: 3° (the track is measured on the chart), 0.3 kn and 3 minutes (or 5 %).

    Course to steer: ________ °T   Speed over the ground: ________ kn   Time to the mark: ________ min  

  3. You are at 320°T, 3.0 nm from Tern Island tower, bound for Green can "1". Your speed through the water is 5.1 kn. The current sets 174°T at 1.8 kn.

    Find the true course to steer that keeps you on the straight track to the buoy, your speed over the ground, and how many minutes it will take.

    Tolerance: 3° (the track is measured on the chart), 0.3 kn and 3 minutes (or 5 %).

    Course to steer: ________ °T   Speed over the ground: ________ kn   Time to the mark: ________ min  

  4. You are at 335°T, 1.7 nm from Tern Island tower, bound for Green can "3". Your speed through the water is 10.6 kn. The current sets 115°T at 2.5 kn.

    Find the true course to steer that keeps you on the straight track to the buoy, your speed over the ground, and how many minutes it will take.

    Tolerance: 3° (the track is measured on the chart), 0.3 kn and 3 minutes (or 5 %).

    Course to steer: ________ °T   Speed over the ground: ________ kn   Time to the mark: ________ min  

  5. You are at 177°T, 1.1 nm from Gannet Rock daybeacon, bound for Green can "1". Your speed through the water is 11.0 kn. The current sets 122°T at 2.2 kn.

    Find the true course to steer that keeps you on the straight track to the buoy, your speed over the ground, and how many minutes it will take.

    Tolerance: 3° (the track is measured on the chart), 0.3 kn and 3 minutes (or 5 %).

    Course to steer: ________ °T   Speed over the ground: ________ kn   Time to the mark: ________ min  

  6. You are at 300°T, 2.0 nm from Tern Island tower, bound for Bell buoy "HS". Your speed through the water is 11.0 kn. The current sets 115°T at 1.9 kn.

    Find the true course to steer that keeps you on the straight track to the buoy, your speed over the ground, and how many minutes it will take.

    Tolerance: 3° (the track is measured on the chart), 0.3 kn and 3 minutes (or 5 %).

    Course to steer: ________ °T   Speed over the ground: ________ kn   Time to the mark: ________ min  

  7. You are at 221°T, 1.6 nm from Gannet Rock daybeacon, bound for Red nun "2". Your speed through the water is 6.0 kn. The current sets 073°T at 1.4 kn.

    Find the true course to steer that keeps you on the straight track to the buoy, your speed over the ground, and how many minutes it will take.

    Tolerance: 3° (the track is measured on the chart), 0.3 kn and 3 minutes (or 5 %).

    Course to steer: ________ °T   Speed over the ground: ________ kn   Time to the mark: ________ min  

  8. You are at 223°T, 1.7 nm from Gannet Rock daybeacon, bound for Green can "3". Your speed through the water is 6.8 kn. The current sets 181°T at 1.7 kn.

    Find the true course to steer that keeps you on the straight track to the buoy, your speed over the ground, and how many minutes it will take.

    Tolerance: 3° (the track is measured on the chart), 0.3 kn and 3 minutes (or 5 %).

    Course to steer: ________ °T   Speed over the ground: ________ kn   Time to the mark: ________ min  

Practice Sheet No. 1

Practice Sheet No. 1 with the starting fixes of this worksheet 34 41 22 38 29 18 27 44 12 21 19 N VAR 7°W (invented) Heron Sound Heron Point Tern Island Westfield Kittle Gannet Rock Fl W 4s 52ft 14M TR TANK SPIRE STACK Dbn 1 2 3 HS 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Border scale: nautical miles (1 nm = 10 ticks) PRACTICE SHEET No. 1 · HERON SOUNDInvented for practice · NOT FOR NAVIGATION · Plotroom Start Start Start Start Start Start Start Start

Answer key

No.AnswersProblem
1Course to steer: 072 °T
Speed over the ground: 4.7 kn
Time to the mark: 64 min
No. 646001 (worked solution)
2Course to steer: 166 °T
Speed over the ground: 7.7 kn
Time to the mark: 31 min
No. 646002 (worked solution)
3Course to steer: 205 °T
Speed over the ground: 6.7 kn
Time to the mark: 51 min
No. 646003 (worked solution)
4Course to steer: 211 °T
Speed over the ground: 10.6 kn
Time to the mark: 19 min
No. 646004 (worked solution)
5Course to steer: 280 °T
Speed over the ground: 9.0 kn
Time to the mark: 37 min
No. 646005 (worked solution)
6Course to steer: 082 °T
Speed over the ground: 12.6 kn
Time to the mark: 27 min
No. 646006 (worked solution)
7Course to steer: 280 °T
Speed over the ground: 4.8 kn
Time to the mark: 49 min
No. 646007 (worked solution)
8Course to steer: 323 °T
Speed over the ground: 5.6 kn
Time to the mark: 34 min
No. 646008 (worked solution)