Worksheet 151 · Skill 3

Dead reckoning

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1. At 0935 you fix your position 008°T, 2.4 nm from Tern Island tower. You steer 092°T at 9.2 kn until 0950, then 171°T at 7.9 kn until 1030.

   Give the 1030 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  

2. At 1300 you fix your position 293°T, 3.8 nm from Tern Island tower. You steer 233°T at 5.1 kn until 1320, then 354°T at 7.4 kn until 1330.

   Give the 1330 DR position as the true bearing FROM Westfield church spire 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 Westfield church spire: ________ °T   Distance: ________ nm  

3. At 0720 you fix your position 032°T, 2.7 nm from Heron Point Light. You steer 013°T at 7.8 kn until 0740, then 208°T at 5.3 kn until 0820.

   Give the 0820 DR position as the true bearing FROM Heron Point Light 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 Heron Point Light: ________ °T   Distance: ________ nm  

4. At 1505 you fix your position 030°T, 2.2 nm from Kittle water tank. You steer 328°T at 7.2 kn until 1525, then 113°T at 4.1 kn until 1540.

   Give the 1540 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 1410 you fix your position 244°T, 3.6 nm from Tern Island tower. You steer 019°T at 4.0 kn until 1435, then 128°T at 7.0 kn until 1520.

   Give the 1520 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  

6. At 0905 you fix your position 220°T, 1.9 nm from Gannet Rock daybeacon. You steer 279°T at 5.3 kn until 0950, then 326°T at 8.7 kn until 1005.

   Give the 1005 DR position as the true bearing FROM Westfield church spire 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 Westfield church spire: ________ °T   Distance: ________ nm  

7. At 1420 you fix your position 284°T, 1.2 nm from Gannet Rock daybeacon. You steer 182°T at 9.1 kn until 1430, then 325°T at 4.3 kn until 1505.

   Give the 1505 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 1505 you fix your position 218°T, 1.8 nm from Gannet Rock daybeacon. You steer 008°T at 4.4 kn until 1520, then 278°T at 9.8 kn until 1545.

   Give the 1545 DR position as the true bearing FROM Heron Point Light 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 Heron Point Light: ________ °T   Distance: ________ nm