Worksheet 104 · Skill 3

Dead reckoning

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1. At 1030 you fix your position 009°T, 2.0 nm from Mill stack. You steer 284°T at 5.6 kn until 1105, then 008°T at 9.8 kn until 1120.

   Give the 1120 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 1545 you fix your position 055°T, 2.7 nm from Heron Point Light. You steer 318°T at 4.4 kn until 1620, then 064°T at 6.7 kn until 1640.

   Give the 1640 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  

3. At 0740 you fix your position 006°T, 2.7 nm from Westfield church spire. You steer 106°T at 6.9 kn until 0755, then 075°T at 9.4 kn until 0810.

   Give the 0810 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  

4. At 1400 you fix your position 145°T, 1.4 nm from Tern Island tower. You steer 107°T at 5.7 kn until 1420, then 284°T at 4.6 kn until 1455.

   Give the 1455 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 0815 you fix your position 288°T, 2.8 nm from Tern Island tower. You steer 183°T at 6.4 kn until 0835, then 114°T at 8.2 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  

6. At 1600 you fix your position 007°T, 3.3 nm from Westfield church spire. You steer 108°T at 5.3 kn until 1640, then 277°T at 6.8 kn until 1700.

   Give the 1700 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 0745 you fix your position 063°T, 2.6 nm from Tern Island tower. You steer 181°T at 6.9 kn until 0820, then 253°T at 10.0 kn until 0855.

   Give the 0855 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  

8. At 0845 you fix your position 349°T, 2.6 nm from Mill stack. You steer 084°T at 5.6 kn until 0910, then 333°T at 4.0 kn until 0935.

   Give the 0935 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