Worksheet 459 · Skill 3

Dead reckoning

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1. At 0915 you fix your position 056°T, 2.7 nm from Heron Point Light. You steer 035°T at 7.0 kn until 0925, then 342°T at 8.3 kn until 0955.

   Give the 0955 DR position as the true bearing FROM Tern Island tower to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Tern Island tower: ________ °T   Distance: ________ nm  

2. At 1200 you fix your position 359°T, 1.5 nm from Gannet Rock daybeacon. You steer 150°T at 6.6 kn until 1215, then 357°T at 7.1 kn until 1235.

   Give the 1235 DR position as the true bearing FROM Tern Island tower to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Tern Island tower: ________ °T   Distance: ________ nm  

3. At 1005 you fix your position 011°T, 1.8 nm from Mill stack. You steer 295°T at 4.4 kn until 1035, then 169°T at 7.8 kn until 1045.

   Give the 1045 DR position as the true bearing FROM Mill stack to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Mill stack: ________ °T   Distance: ________ nm  

4. At 1530 you fix your position 082°T, 2.0 nm from Tern Island tower. You steer 326°T at 5.9 kn until 1540, then 147°T at 7.6 kn until 1615.

   Give the 1615 DR position as the true bearing FROM Gannet Rock daybeacon to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Gannet Rock daybeacon: ________ °T   Distance: ________ nm  

5. At 1320 you fix your position 332°T, 1.9 nm from Tern Island tower. You steer 216°T at 8.7 kn until 1350, then 163°T at 8.3 kn until 1410.

   Give the 1410 DR position as the true bearing FROM Mill stack to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Mill stack: ________ °T   Distance: ________ nm  

6. At 0735 you fix your position 052°T, 3.4 nm from Heron Point Light. You steer 100°T at 8.6 kn until 0820, then 030°T at 7.6 kn until 0830.

   Give the 0830 DR position as the true bearing FROM Gannet Rock daybeacon to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Gannet Rock daybeacon: ________ °T   Distance: ________ nm  

7. At 0710 you fix your position 068°T, 4.5 nm from Tern Island tower. You steer 221°T at 9.6 kn until 0720, then 028°T at 6.3 kn until 0730.

   Give the 0730 DR position as the true bearing FROM Tern Island tower to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Tern Island tower: ________ °T   Distance: ________ nm  

8. At 0700 you fix your position 059°T, 4.9 nm from Tern Island tower. You steer 220°T at 5.1 kn until 0725, then 075°T at 4.8 kn until 0745.

   Give the 0745 DR position as the true bearing FROM Tern Island tower to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Tern Island tower: ________ °T   Distance: ________ nm