Worksheet 45 · Skill 3

Dead reckoning

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1. At 0930 you fix your position 302°T, 3.7 nm from Tern Island tower. You steer 196°T at 4.4 kn until 0950, then 258°T at 7.6 kn until 1000.

   Give the 1000 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 0745 you fix your position 340°T, 2.7 nm from Mill stack. You steer 358°T at 8.2 kn until 0755, then 132°T at 5.1 kn until 0840.

   Give the 0840 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 1105 you fix your position 094°T, 2.8 nm from Gannet Rock daybeacon. You steer 165°T at 8.8 kn until 1115, then 318°T at 4.8 kn until 1155.

   Give the 1155 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 0940 you fix your position 006°T, 1.9 nm from Tern Island tower. You steer 276°T at 4.3 kn until 1015, then 182°T at 5.3 kn until 1055.

   Give the 1055 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 1530 you fix your position 045°T, 3.4 nm from Gannet Rock daybeacon. You steer 256°T at 6.4 kn until 1615, then 310°T at 5.2 kn until 1650.

   Give the 1650 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  

6. At 1315 you fix your position 037°T, 2.9 nm from Tern Island tower. You steer 126°T at 5.7 kn until 1350, then 225°T at 7.3 kn until 1410.

   Give the 1410 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  

7. At 0845 you fix your position 048°T, 2.5 nm from Heron Point Light. You steer 333°T at 9.8 kn until 0900, then 096°T at 4.7 kn until 0945.

   Give the 0945 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 1415 you fix your position 271°T, 2.5 nm from Tern Island tower. You steer 246°T at 5.1 kn until 1450, then 178°T at 4.6 kn until 1505.

   Give the 1505 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