Worksheet 107 · Skill 3

Dead reckoning

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1. At 0940 you fix your position 053°T, 1.5 nm from Tern Island tower. You steer 110°T at 6.2 kn until 0950, then 290°T at 5.1 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  

2. At 1000 you fix your position 253°T, 3.3 nm from Tern Island tower. You steer 093°T at 6.5 kn until 1025, then 150°T at 7.6 kn until 1055.

   Give the 1055 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 0815 you fix your position 071°T, 2.1 nm from Gannet Rock daybeacon. You steer 284°T at 6.2 kn until 0835, then 090°T at 5.2 kn until 0900.

   Give the 0900 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  

4. At 1015 you fix your position 250°T, 2.7 nm from Tern Island tower. You steer 141°T at 8.2 kn until 1025, then 324°T at 9.6 kn until 1100.

   Give the 1100 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  

5. At 1320 you fix your position 049°T, 3.2 nm from Heron Point Light. You steer 316°T at 9.4 kn until 1345, then 028°T at 7.0 kn until 1405.

   Give the 1405 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 1425 you fix your position 352°T, 2.2 nm from Mill stack. You steer 291°T at 6.2 kn until 1500, then 077°T at 8.9 kn until 1520.

   Give the 1520 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 0740 you fix your position 305°T, 2.0 nm from Tern Island tower. You steer 181°T at 6.1 kn until 0800, then 224°T at 7.7 kn until 0820.

   Give the 0820 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 0750 you fix your position 299°T, 4.1 nm from Tern Island tower. You steer 153°T at 8.3 kn until 0835, then 035°T at 5.3 kn until 0905.

   Give the 0905 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