Worksheet 557 · Skill 3

Dead reckoning

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1. At 0810 you fix your position 153°T, 1.5 nm from Tern Island tower. You steer 102°T at 8.2 kn until 0825, then 017°T at 4.7 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  

2. At 1055 you fix your position 071°T, 2.8 nm from Tern Island tower. You steer 151°T at 7.1 kn until 1130, then 339°T at 5.2 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  

3. At 1455 you fix your position 042°T, 3.6 nm from Westfield church spire. You steer 121°T at 9.0 kn until 1520, then 164°T at 9.7 kn until 1545.

   Give the 1545 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  

4. At 1450 you fix your position 006°T, 2.0 nm from Heron Point Light. You steer 331°T at 4.6 kn until 1510, then 180°T at 9.2 kn until 1525.

   Give the 1525 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  

5. At 0750 you fix your position 245°T, 1.9 nm from Tern Island tower. You steer 265°T at 8.2 kn until 0810, then 353°T at 4.6 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  

6. At 1545 you fix your position 026°T, 3.1 nm from Westfield church spire. You steer 122°T at 4.6 kn until 1555, then 326°T at 9.5 kn until 1605.

   Give the 1605 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 0750 you fix your position 302°T, 4.2 nm from Tern Island tower. You steer 139°T at 4.8 kn until 0835, then 283°T at 4.9 kn until 0905.

   Give the 0905 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 0900 you fix your position 095°T, 2.1 nm from Gannet Rock daybeacon. You steer 355°T at 6.3 kn until 0920, then 074°T at 4.2 kn until 0935.

   Give the 0935 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