Worksheet 607 · Skill 3

Dead reckoning

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1. At 0805 you fix your position 025°T, 2.1 nm from Mill stack. You steer 214°T at 5.8 kn until 0815, then 061°T at 6.1 kn until 0830.

   Give the 0830 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  

2. At 0845 you fix your position 245°T, 1.3 nm from Gannet Rock daybeacon. You steer 224°T at 5.9 kn until 0905, then 290°T at 5.9 kn until 0920.

   Give the 0920 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 0835 you fix your position 220°T, 3.0 nm from Tern Island tower. You steer 080°T at 9.6 kn until 0905, then 172°T at 8.3 kn until 0915.

   Give the 0915 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 1300 you fix your position 067°T, 3.2 nm from Tern Island tower. You steer 162°T at 6.0 kn until 1345, then 015°T at 5.3 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  

5. At 0915 you fix your position 236°T, 2.2 nm from Gannet Rock daybeacon. You steer 277°T at 6.8 kn until 0935, then 106°T at 4.6 kn until 1005.

   Give the 1005 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  

6. At 0900 you fix your position 074°T, 1.8 nm from Westfield church spire. You steer 106°T at 8.8 kn until 0930, then 191°T at 4.4 kn until 0940.

   Give the 0940 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 042°T, 2.9 nm from Tern Island tower. You steer 150°T at 8.5 kn until 1530, then 208°T at 5.3 kn until 1550.

   Give the 1550 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

8. At 0825 you fix your position 084°T, 1.4 nm from Westfield church spire. You steer 156°T at 5.1 kn until 0845, then 005°T at 6.3 kn until 0925.

   Give the 0925 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