Worksheet 124 · Skill 3

Dead reckoning

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1. At 1430 you fix your position 059°T, 2.1 nm from Westfield church spire. You steer 089°T at 6.4 kn until 1455, then 023°T at 4.4 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  

2. At 0950 you fix your position 278°T, 0.9 nm from Gannet Rock daybeacon. You steer 249°T at 7.4 kn until 1030, then 007°T at 5.8 kn until 1055.

   Give the 1055 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  

3. At 0950 you fix your position 014°T, 1.4 nm from Westfield church spire. You steer 048°T at 6.4 kn until 1010, then 288°T at 6.0 kn until 1020.

   Give the 1020 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  

4. At 1330 you fix your position 349°T, 1.6 nm from Gannet Rock daybeacon. You steer 023°T at 4.8 kn until 1400, then 180°T at 7.8 kn until 1440.

   Give the 1440 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 1025 you fix your position 098°T, 2.5 nm from Westfield church spire. You steer 008°T at 7.8 kn until 1050, then 185°T at 4.2 kn until 1105.

   Give the 1105 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  

6. At 0750 you fix your position 091°T, 1.6 nm from Westfield church spire. You steer 014°T at 7.9 kn until 0815, then 239°T at 6.7 kn until 0830.

   Give the 0830 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 0910 you fix your position 023°T, 1.9 nm from Heron Point Light. You steer 099°T at 8.9 kn until 0920, then 342°T at 5.9 kn until 1000.

   Give the 1000 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  

8. At 0900 you fix your position 069°T, 4.8 nm from Tern Island tower. You steer 200°T at 9.1 kn until 0940, then 316°T at 6.8 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