Worksheet 5 · Skill 3

Dead reckoning

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1. At 1340 you fix your position 041°T, 4.6 nm from Westfield church spire. You steer 101°T at 9.0 kn until 1415, then 135°T at 8.6 kn until 1430.

   Give the 1430 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  

2. At 1405 you fix your position 220°T, 3.4 nm from Tern Island tower. You steer 108°T at 4.1 kn until 1425, then 339°T at 8.6 kn until 1445.

   Give the 1445 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 0755 you fix your position 027°T, 2.7 nm from Heron Point Light. You steer 137°T at 5.4 kn until 0825, then 328°T at 4.5 kn until 0900.

   Give the 0900 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  

4. At 0725 you fix your position 237°T, 2.5 nm from Tern Island tower. You steer 299°T at 6.2 kn until 0745, then 144°T at 7.3 kn until 0815.

   Give the 0815 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 0820 you fix your position 105°T, 1.7 nm from Tern Island tower. You steer 231°T at 9.3 kn until 0855, then 353°T at 8.5 kn until 0930.

   Give the 0930 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 1055 you fix your position 347°T, 1.9 nm from Mill stack. You steer 017°T at 8.9 kn until 1105, then 329°T at 8.0 kn until 1120.

   Give the 1120 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 0700 you fix your position 052°T, 3.5 nm from Westfield church spire. You steer 156°T at 9.9 kn until 0710, then 057°T at 5.9 kn until 0755.

   Give the 0755 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 1130 you fix your position 092°T, 3.6 nm from Westfield church spire. You steer 114°T at 6.1 kn until 1215, then 274°T at 5.2 kn until 1300.

   Give the 1300 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