Worksheet 606 · Skill 3

Dead reckoning

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1. At 0705 you fix your position 218°T, 2.6 nm from Tern Island tower. You steer 355°T at 6.8 kn until 0725, then 031°T at 7.8 kn until 0735.

   Give the 0735 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 1210 you fix your position 339°T, 2.3 nm from Mill stack. You steer 243°T at 5.2 kn until 1220, then 009°T at 7.3 kn until 1230.

   Give the 1230 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  

3. At 0735 you fix your position 264°T, 2.3 nm from Tern Island tower. You steer 254°T at 5.7 kn until 0805, then 215°T at 5.5 kn until 0830.

   Give the 0830 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 0805 you fix your position 293°T, 2.2 nm from Tern Island tower. You steer 151°T at 5.7 kn until 0820, then 254°T at 7.9 kn until 0850.

   Give the 0850 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 0830 you fix your position 046°T, 1.4 nm from Heron Point Light. You steer 096°T at 5.0 kn until 0905, then 311°T at 5.8 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  

6. At 0710 you fix your position 281°T, 3.5 nm from Tern Island tower. You steer 137°T at 8.5 kn until 0755, then 093°T at 4.6 kn until 0805.

   Give the 0805 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 0805 you fix your position 320°T, 1.7 nm from Kittle water tank. You steer 277°T at 4.9 kn until 0835, then 019°T at 5.9 kn until 0850.

   Give the 0850 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 1030 you fix your position 291°T, 3.6 nm from Tern Island tower. You steer 192°T at 6.4 kn until 1110, then 339°T at 6.1 kn until 1150.

   Give the 1150 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