Worksheet 344 · Skill 3

Dead reckoning

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1. At 1435 you fix your position 050°T, 3.3 nm from Heron Point Light. You steer 030°T at 9.0 kn until 1510, then 285°T at 4.7 kn until 1520.

   Give the 1520 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 1030 you fix your position 060°T, 3.8 nm from Tern Island tower. You steer 169°T at 9.3 kn until 1105, then 293°T at 5.3 kn until 1120.

   Give the 1120 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 1455 you fix your position 080°T, 2.1 nm from Heron Point Light. You steer 326°T at 8.1 kn until 1540, then 150°T at 4.3 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  

4. At 1340 you fix your position 307°T, 3.3 nm from Tern Island tower. You steer 205°T at 7.6 kn until 1400, then 334°T at 5.4 kn until 1435.

   Give the 1435 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 1010 you fix your position 298°T, 3.5 nm from Tern Island tower. You steer 261°T at 9.9 kn until 1035, then 097°T at 9.1 kn until 1100.

   Give the 1100 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 1415 you fix your position 232°T, 3.5 nm from Tern Island tower. You steer 074°T at 4.2 kn until 1425, then 342°T at 8.9 kn until 1455.

   Give the 1455 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 1000 you fix your position 033°T, 3.2 nm from Westfield church spire. You steer 136°T at 8.2 kn until 1010, then 093°T at 7.7 kn until 1030.

   Give the 1030 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 0855 you fix your position 277°T, 1.8 nm from Gannet Rock daybeacon. You steer 056°T at 4.8 kn until 0935, then 123°T at 8.0 kn until 0955.

   Give the 0955 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