Worksheet 404 · Skill 3

Dead reckoning

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1. At 1120 you fix your position 318°T, 1.7 nm from Tern Island tower. You steer 247°T at 6.2 kn until 1145, then 302°T at 7.2 kn until 1205.

   Give the 1205 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 1235 you fix your position 076°T, 1.8 nm from Tern Island tower. You steer 145°T at 7.2 kn until 1305, then 227°T at 8.1 kn until 1325.

   Give the 1325 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

3. At 1500 you fix your position 256°T, 2.9 nm from Gannet Rock daybeacon. You steer 180°T at 6.2 kn until 1515, then 023°T at 7.6 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  

4. At 0845 you fix your position 039°T, 3.3 nm from Heron Point Light. You steer 347°T at 6.9 kn until 0900, then 053°T at 10.0 kn until 0925.

   Give the 0925 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  

5. At 0730 you fix your position 052°T, 2.4 nm from Westfield church spire. You steer 099°T at 6.2 kn until 0755, then 194°T at 5.3 kn until 0820.

   Give the 0820 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 1015 you fix your position 129°T, 1.5 nm from Tern Island tower. You steer 027°T at 4.6 kn until 1025, then 125°T at 4.9 kn until 1040.

   Give the 1040 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 1145 you fix your position 024°T, 2.1 nm from Gannet Rock daybeacon. You steer 333°T at 5.5 kn until 1215, then 160°T at 5.9 kn until 1250.

   Give the 1250 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 0710 you fix your position 112°T, 1.8 nm from Gannet Rock daybeacon. You steer 121°T at 10.0 kn until 0720, then 241°T at 5.6 kn until 0730.

   Give the 0730 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm