Worksheet 436 · Skill 3

Dead reckoning

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1. At 0825 you fix your position 021°T, 1.8 nm from Mill stack. You steer 313°T at 6.3 kn until 0900, then 075°T at 7.3 kn until 0920.

   Give the 0920 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 0850 you fix your position 035°T, 2.5 nm from Mill stack. You steer 276°T at 9.7 kn until 0900, then 324°T at 8.8 kn until 0915.

   Give the 0915 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 0715 you fix your position 016°T, 1.8 nm from Kittle water tank. You steer 010°T at 4.4 kn until 0745, then 214°T at 5.2 kn until 0805.

   Give the 0805 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  

4. At 0950 you fix your position 040°T, 2.6 nm from Gannet Rock daybeacon. You steer 237°T at 7.3 kn until 1020, then 277°T at 4.4 kn until 1055.

   Give the 1055 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  

5. At 1110 you fix your position 179°T, 1.4 nm from Tern Island tower. You steer 211°T at 4.8 kn until 1135, then 130°T at 8.5 kn until 1150.

   Give the 1150 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 0755 you fix your position 033°T, 2.8 nm from Tern Island tower. You steer 153°T at 9.5 kn until 0825, then 096°T at 6.6 kn until 0835.

   Give the 0835 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 0850 you fix your position 080°T, 3.3 nm from Westfield church spire. You steer 111°T at 10.0 kn until 0915, then 311°T at 4.2 kn until 0925.

   Give the 0925 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 1055 you fix your position 209°T, 1.1 nm from Gannet Rock daybeacon. You steer 190°T at 5.5 kn until 1105, then 287°T at 6.7 kn until 1135.

   Give the 1135 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