Worksheet 342 · Skill 3

Dead reckoning

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1. At 1530 you fix your position 155°T, 2.9 nm from Tern Island tower. You steer 027°T at 9.9 kn until 1550, then 176°T at 6.4 kn until 1615.

   Give the 1615 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 1515 you fix your position 230°T, 3.4 nm from Tern Island tower. You steer 060°T at 7.4 kn until 1530, then 320°T at 9.6 kn until 1550.

   Give the 1550 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  

3. At 0945 you fix your position 014°T, 1.1 nm from Kittle water tank. You steer 298°T at 9.5 kn until 1030, then 224°T at 5.8 kn until 1110.

   Give the 1110 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 0815 you fix your position 293°T, 3.1 nm from Tern Island tower. You steer 077°T at 9.5 kn until 0850, then 180°T at 9.4 kn until 0930.

   Give the 0930 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 0850 you fix your position 007°T, 2.7 nm from Mill stack. You steer 213°T at 10.0 kn until 0900, then 348°T at 9.8 kn until 0910.

   Give the 0910 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 0755 you fix your position 105°T, 1.5 nm from Tern Island tower. You steer 127°T at 5.6 kn until 0815, then 346°T at 9.1 kn until 0830.

   Give the 0830 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 1540 you fix your position 261°T, 2.7 nm from Tern Island tower. You steer 356°T at 4.3 kn until 1615, then 097°T at 5.9 kn until 1635.

   Give the 1635 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 0755 you fix your position 001°T, 2.2 nm from Heron Point Light. You steer 340°T at 4.3 kn until 0815, then 031°T at 9.6 kn until 0840.

   Give the 0840 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