Worksheet 164 · Skill 3

Dead reckoning

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1. At 0820 you fix your position 257°T, 2.9 nm from Gannet Rock daybeacon. You steer 280°T at 9.5 kn until 0845, then 125°T at 9.2 kn until 0915.

   Give the 0915 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 0730 you fix your position 244°T, 3.5 nm from Tern Island tower. You steer 081°T at 9.1 kn until 0745, then 311°T at 5.1 kn until 0810.

   Give the 0810 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 1545 you fix your position 351°T, 3.5 nm from Mill stack. You steer 339°T at 5.8 kn until 1615, then 050°T at 9.7 kn until 1630.

   Give the 1630 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 1425 you fix your position 306°T, 1.6 nm from Tern Island tower. You steer 193°T at 4.4 kn until 1510, then 265°T at 8.3 kn until 1540.

   Give the 1540 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 0855 you fix your position 263°T, 2.2 nm from Gannet Rock daybeacon. You steer 297°T at 8.1 kn until 0915, then 195°T at 5.5 kn until 0925.

   Give the 0925 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  

6. At 1010 you fix your position 017°T, 2.3 nm from Gannet Rock daybeacon. You steer 159°T at 9.2 kn until 1025, then 069°T at 5.3 kn until 1040.

   Give the 1040 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 0710 you fix your position 023°T, 1.4 nm from Heron Point Light. You steer 093°T at 4.7 kn until 0745, then 341°T at 7.2 kn until 0830.

   Give the 0830 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 1520 you fix your position 090°T, 3.5 nm from Westfield church spire. You steer 219°T at 4.8 kn until 1555, then 104°T at 7.6 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