Worksheet 94 · Skill 3

Dead reckoning

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1. At 1140 you fix your position 090°T, 1.9 nm from Tern Island tower. You steer 153°T at 4.9 kn until 1215, then 332°T at 5.8 kn until 1235.

   Give the 1235 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 0820 you fix your position 202°T, 1.5 nm from Gannet Rock daybeacon. You steer 302°T at 4.4 kn until 0855, then 236°T at 4.6 kn until 0905.

   Give the 0905 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 0950 you fix your position 077°T, 1.0 nm from Heron Point Light. You steer 032°T at 4.3 kn until 1010, then 073°T at 4.1 kn until 1045.

   Give the 1045 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 1445 you fix your position 241°T, 1.0 nm from Gannet Rock daybeacon. You steer 113°T at 4.8 kn until 1515, then 259°T at 8.7 kn until 1555.

   Give the 1555 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 1020 you fix your position 269°T, 2.0 nm from Gannet Rock daybeacon. You steer 299°T at 5.3 kn until 1035, then 354°T at 5.1 kn until 1055.

   Give the 1055 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 0905 you fix your position 356°T, 2.8 nm from Mill stack. You steer 313°T at 7.9 kn until 0920, then 354°T at 4.3 kn until 0950.

   Give the 0950 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 0840 you fix your position 038°T, 1.6 nm from Tern Island tower. You steer 317°T at 9.8 kn until 0850, then 265°T at 8.5 kn until 0910.

   Give the 0910 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 1505 you fix your position 358°T, 2.2 nm from Heron Point Light. You steer 097°T at 7.1 kn until 1530, then 268°T at 7.2 kn until 1545.

   Give the 1545 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