Worksheet 53 · Skill 3

Dead reckoning

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1. At 1250 you fix your position 285°T, 3.6 nm from Tern Island tower. You steer 225°T at 4.2 kn until 1310, then 349°T at 6.2 kn until 1320.

   Give the 1320 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  

2. At 1405 you fix your position 278°T, 3.0 nm from Tern Island tower. You steer 141°T at 4.0 kn until 1430, then 200°T at 7.3 kn until 1450.

   Give the 1450 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 0810 you fix your position 345°T, 2.0 nm from Mill stack. You steer 285°T at 4.0 kn until 0820, then 013°T at 6.3 kn until 0900.

   Give the 0900 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 1500 you fix your position 297°T, 2.2 nm from Tern Island tower. You steer 162°T at 7.7 kn until 1530, then 060°T at 5.0 kn until 1540.

   Give the 1540 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 0910 you fix your position 298°T, 3.1 nm from Tern Island tower. You steer 322°T at 5.1 kn until 0920, then 179°T at 6.3 kn until 1000.

   Give the 1000 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 1545 you fix your position 351°T, 2.6 nm from Mill stack. You steer 314°T at 4.3 kn until 1615, then 038°T at 5.2 kn until 1645.

   Give the 1645 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 1050 you fix your position 216°T, 1.5 nm from Tern Island tower. You steer 293°T at 9.9 kn until 1125, then 136°T at 5.9 kn until 1200.

   Give the 1200 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 0920 you fix your position 257°T, 1.9 nm from Tern Island tower. You steer 137°T at 7.1 kn until 0935, then 289°T at 6.7 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