Worksheet 200 · Skill 3

Dead reckoning

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1. At 0755 you fix your position 068°T, 2.5 nm from Gannet Rock daybeacon. You steer 204°T at 7.8 kn until 0815, then 045°T at 6.8 kn until 0825.

   Give the 0825 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 1335 you fix your position 004°T, 2.6 nm from Mill stack. You steer 287°T at 6.1 kn until 1410, then 094°T at 7.7 kn until 1425.

   Give the 1425 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 0800 you fix your position 045°T, 3.7 nm from Westfield church spire. You steer 191°T at 9.0 kn until 0820, then 043°T at 9.4 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  

4. At 0815 you fix your position 243°T, 2.6 nm from Gannet Rock daybeacon. You steer 240°T at 4.7 kn until 0840, then 010°T at 9.7 kn until 0855.

   Give the 0855 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 1535 you fix your position 063°T, 3.2 nm from Heron Point Light. You steer 336°T at 9.9 kn until 1600, then 267°T at 9.8 kn until 1615.

   Give the 1615 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 0725 you fix your position 340°T, 2.2 nm from Tern Island tower. You steer 249°T at 8.2 kn until 0810, then 013°T at 4.0 kn until 0840.

   Give the 0840 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 0815 you fix your position 041°T, 1.4 nm from Gannet Rock daybeacon. You steer 168°T at 5.5 kn until 0830, then 248°T at 5.4 kn until 0855.

   Give the 0855 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  

8. At 0900 you fix your position 302°T, 3.4 nm from Tern Island tower. You steer 144°T at 8.9 kn until 0920, then 194°T at 7.0 kn until 0955.

   Give the 0955 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