Worksheet 529 · Skill 3

Dead reckoning

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1. At 0825 you fix your position 175°T, 1.7 nm from Tern Island tower. You steer 248°T at 7.4 kn until 0850, then 098°T at 4.8 kn until 0920.

   Give the 0920 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 1430 you fix your position 212°T, 3.2 nm from Tern Island tower. You steer 289°T at 4.7 kn until 1440, then 197°T at 5.4 kn until 1455.

   Give the 1455 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 1140 you fix your position 082°T, 2.3 nm from Heron Point Light. You steer 315°T at 6.4 kn until 1205, then 078°T at 5.6 kn until 1220.

   Give the 1220 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 0855 you fix your position 040°T, 3.4 nm from Heron Point Light. You steer 042°T at 5.4 kn until 0905, then 087°T at 7.1 kn until 0950.

   Give the 0950 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  

5. At 0720 you fix your position 233°T, 2.8 nm from Tern Island tower. You steer 288°T at 6.6 kn until 0755, then 113°T at 5.7 kn until 0810.

   Give the 0810 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 0740 you fix your position 036°T, 3.6 nm from Heron Point Light. You steer 180°T at 4.0 kn until 0815, then 070°T at 7.7 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  

7. At 1240 you fix your position 092°T, 3.4 nm from Westfield church spire. You steer 277°T at 6.3 kn until 1255, then 169°T at 4.2 kn until 1315.

   Give the 1315 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  

8. At 1215 you fix your position 302°T, 3.7 nm from Tern Island tower. You steer 234°T at 6.0 kn until 1235, then 176°T at 7.1 kn until 1320.

   Give the 1320 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