Worksheet 341 · Skill 3

Dead reckoning

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1. At 1025 you fix your position 020°T, 2.9 nm from Heron Point Light. You steer 330°T at 9.6 kn until 1050, then 159°T at 5.0 kn until 1115.

   Give the 1115 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 1135 you fix your position 039°T, 2.8 nm from Gannet Rock daybeacon. You steer 160°T at 5.5 kn until 1155, then 354°T at 4.2 kn until 1230.

   Give the 1230 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 1315 you fix your position 335°T, 2.8 nm from Tern Island tower. You steer 188°T at 9.7 kn until 1340, then 122°T at 5.1 kn until 1350.

   Give the 1350 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 0910 you fix your position 027°T, 2.4 nm from Mill stack. You steer 290°T at 6.3 kn until 0950, then 334°T at 5.6 kn until 1015.

   Give the 1015 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 0735 you fix your position 309°T, 3.8 nm from Tern Island tower. You steer 263°T at 7.0 kn until 0745, then 180°T at 5.0 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 0855 you fix your position 274°T, 2.2 nm from Gannet Rock daybeacon. You steer 214°T at 8.0 kn until 0915, then 335°T at 4.1 kn until 0945.

   Give the 0945 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  

7. At 1110 you fix your position 249°T, 2.0 nm from Gannet Rock daybeacon. You steer 051°T at 10.0 kn until 1130, then 153°T at 7.6 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  

8. At 1525 you fix your position 033°T, 3.3 nm from Westfield church spire. You steer 167°T at 9.3 kn until 1545, then 250°T at 5.4 kn until 1610.

   Give the 1610 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