Worksheet 408 · Skill 3

Dead reckoning

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1. At 0935 you fix your position 043°T, 1.8 nm from Tern Island tower. You steer 102°T at 6.1 kn until 1000, then 135°T at 4.1 kn until 1020.

   Give the 1020 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 069°T, 3.5 nm from Tern Island tower. You steer 278°T at 5.3 kn until 0845, then 319°T at 9.2 kn until 0855.

   Give the 0855 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  

3. At 1110 you fix your position 004°T, 1.1 nm from Gannet Rock daybeacon. You steer 022°T at 8.4 kn until 1125, then 099°T at 4.1 kn until 1140.

   Give the 1140 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 1545 you fix your position 005°T, 3.1 nm from Mill stack. You steer 217°T at 7.2 kn until 1605, then 079°T at 7.3 kn until 1620.

   Give the 1620 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 0750 you fix your position 180°T, 1.4 nm from Tern Island tower. You steer 297°T at 6.8 kn until 0820, then 237°T at 5.2 kn until 0830.

   Give the 0830 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 1340 you fix your position 250°T, 1.2 nm from Gannet Rock daybeacon. You steer 119°T at 5.4 kn until 1410, then 283°T at 6.6 kn until 1435.

   Give the 1435 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 0835 you fix your position 207°T, 2.2 nm from Gannet Rock daybeacon. You steer 295°T at 8.9 kn until 0920, then 185°T at 4.8 kn until 0940.

   Give the 0940 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 0810 you fix your position 067°T, 2.5 nm from Heron Point Light. You steer 075°T at 5.1 kn until 0840, then 186°T at 8.2 kn until 0850.

   Give the 0850 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