Worksheet 462 · Skill 3

Dead reckoning

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1. At 1420 you fix your position 043°T, 1.3 nm from Heron Point Light. You steer 037°T at 8.1 kn until 1450, then 303°T at 5.5 kn until 1525.

   Give the 1525 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 1140 you fix your position 073°T, 3.3 nm from Westfield church spire. You steer 143°T at 5.8 kn until 1200, then 216°T at 5.4 kn until 1235.

   Give the 1235 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  

3. At 0700 you fix your position 067°T, 3.4 nm from Westfield church spire. You steer 218°T at 7.1 kn until 0725, then 110°T at 5.0 kn until 0755.

   Give the 0755 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 0720 you fix your position 035°T, 2.4 nm from Mill stack. You steer 081°T at 7.9 kn until 0740, then 005°T at 8.2 kn until 0800.

   Give the 0800 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 1455 you fix your position 031°T, 1.5 nm from Heron Point Light. You steer 034°T at 10.0 kn until 1530, then 272°T at 9.6 kn until 1550.

   Give the 1550 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 0950 you fix your position 347°T, 0.9 nm from Gannet Rock daybeacon. You steer 010°T at 6.1 kn until 1005, then 230°T at 7.5 kn until 1015.

   Give the 1015 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 1455 you fix your position 328°T, 1.4 nm from Tern Island tower. You steer 263°T at 7.5 kn until 1530, then 182°T at 4.9 kn until 1605.

   Give the 1605 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 0730 you fix your position 320°T, 3.0 nm from Tern Island tower. You steer 244°T at 9.4 kn until 0750, then 212°T at 6.3 kn until 0810.

   Give the 0810 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