Worksheet 447 · Skill 3

Dead reckoning

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1. At 1550 you fix your position 221°T, 2.9 nm from Tern Island tower. You steer 190°T at 4.5 kn until 1610, then 081°T at 8.7 kn until 1655.

   Give the 1655 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 0830 you fix your position 088°T, 1.3 nm from Gannet Rock daybeacon. You steer 345°T at 5.3 kn until 0915, then 200°T at 9.9 kn until 0940.

   Give the 0940 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 0900 you fix your position 209°T, 2.4 nm from Tern Island tower. You steer 332°T at 8.0 kn until 0930, then 158°T at 5.3 kn until 0955.

   Give the 0955 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 0855 you fix your position 032°T, 3.4 nm from Heron Point Light. You steer 197°T at 5.3 kn until 0905, then 123°T at 5.5 kn until 0935.

   Give the 0935 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  

5. At 0710 you fix your position 048°T, 4.1 nm from Westfield church spire. You steer 130°T at 8.8 kn until 0745, then 323°T at 6.1 kn until 0800.

   Give the 0800 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 1345 you fix your position 092°T, 3.5 nm from Westfield church spire. You steer 125°T at 6.0 kn until 1420, then 227°T at 9.6 kn until 1430.

   Give the 1430 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  

7. At 1125 you fix your position 048°T, 3.0 nm from Westfield church spire. You steer 080°T at 8.2 kn until 1205, then 129°T at 9.1 kn until 1240.

   Give the 1240 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  

8. At 1010 you fix your position 244°T, 2.5 nm from Gannet Rock daybeacon. You steer 131°T at 10.0 kn until 1020, then 009°T at 5.3 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