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Worksheet 139 · Skill 6

Course to steer

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  1. You are at 100°T, 1.4 nm from Westfield church spire, bound for Green can "3". Your speed through the water is 5.1 kn. The current sets 148°T at 2.1 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 301°T, 3.6 nm from Tern Island tower, bound for Green can "1". Your speed through the water is 6.1 kn. The current sets 333°T at 0.8 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  

  3. You are at 128°T, 1.4 nm from Westfield church spire, bound for Red nun "2". Your speed through the water is 11.0 kn. The current sets 339°T at 1.6 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 036°T, 1.9 nm from Gannet Rock daybeacon, bound for Red nun "2". Your speed through the water is 10.2 kn. The current sets 206°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  

  5. You are at 019°T, 2.7 nm from Mill stack, bound for Red nun "2". Your speed through the water is 8.5 kn. The current sets 079°T at 2.0 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 053°T, 2.8 nm from Gannet Rock daybeacon, bound for Red nun "2". Your speed through the water is 5.3 kn. The current sets 224°T at 1.5 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  

  7. You are at 078°T, 3.3 nm from Westfield church spire, bound for Green can "1". Your speed through the water is 6.9 kn. The current sets 274°T at 0.5 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  

  8. You are at 084°T, 1.8 nm from Gannet Rock daybeacon, bound for Green can "3". Your speed through the water is 5.4 kn. The current sets 041°T at 0.6 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: 074 °T
Speed over the ground: 6.0 kn
Time to the mark: 42 min
No. 139001 (worked solution)
2Course to steer: 182 °T
Speed over the ground: 5.4 kn
Time to the mark: 55 min
No. 139002 (worked solution)
3Course to steer: 107 °T
Speed over the ground: 10.1 kn
Time to the mark: 19 min
No. 139003 (worked solution)
4Course to steer: 263 °T
Speed over the ground: 11.2 kn
Time to the mark: 33 min
No. 139004 (worked solution)
5Course to steer: 290 °T
Speed over the ground: 6.9 kn
Time to the mark: 21 min
No. 139005 (worked solution)
6Course to steer: 265 °T
Speed over the ground: 6.5 kn
Time to the mark: 67 min
No. 139006 (worked solution)
7Course to steer: 166 °T
Speed over the ground: 6.8 kn
Time to the mark: 24 min
No. 139007 (worked solution)
8Course to steer: 272 °T
Speed over the ground: 5.0 kn
Time to the mark: 63 min
No. 139008 (worked solution)