Worksheet 476 · Skill 3

Dead reckoning

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1. At 0810 you fix your position 009°T, 2.2 nm from Westfield church spire. You steer 114°T at 4.6 kn until 0835, then 063°T at 4.2 kn until 0850.

   Give the 0850 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  

2. At 0750 you fix your position 277°T, 1.7 nm from Gannet Rock daybeacon. You steer 275°T at 8.2 kn until 0815, then 188°T at 5.2 kn until 0830.

   Give the 0830 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 0900 you fix your position 044°T, 2.8 nm from Heron Point Light. You steer 027°T at 7.3 kn until 0925, then 225°T at 9.5 kn until 0955.

   Give the 0955 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 1555 you fix your position 019°T, 2.5 nm from Tern Island tower. You steer 251°T at 10.0 kn until 1605, then 109°T at 8.5 kn until 1645.

   Give the 1645 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 0900 you fix your position 206°T, 2.6 nm from Tern Island tower. You steer 269°T at 4.3 kn until 0945, then 299°T at 4.1 kn until 0955.

   Give the 0955 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  

6. At 1220 you fix your position 009°T, 2.1 nm from Westfield church spire. You steer 106°T at 9.2 kn until 1240, then 040°T at 5.1 kn until 1300.

   Give the 1300 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  

7. At 1440 you fix your position 281°T, 2.4 nm from Tern Island tower. You steer 170°T at 8.2 kn until 1450, then 003°T at 7.9 kn until 1500.

   Give the 1500 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 1355 you fix your position 081°T, 3.5 nm from Westfield church spire. You steer 353°T at 7.2 kn until 1420, then 186°T at 9.5 kn until 1440.

   Give the 1440 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