Worksheet 152 · Skill 3

Dead reckoning

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1. At 0900 you fix your position 078°T, 2.4 nm from Westfield church spire. You steer 201°T at 5.2 kn until 0915, then 354°T at 5.1 kn until 0945.

   Give the 0945 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 1440 you fix your position 337°T, 2.3 nm from Mill stack. You steer 019°T at 4.4 kn until 1520, then 093°T at 7.3 kn until 1545.

   Give the 1545 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 1525 you fix your position 054°T, 4.0 nm from Tern Island tower. You steer 133°T at 9.2 kn until 1540, then 253°T at 8.9 kn until 1550.

   Give the 1550 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 0710 you fix your position 218°T, 2.1 nm from Gannet Rock daybeacon. You steer 276°T at 4.6 kn until 0755, then 094°T at 9.5 kn until 0810.

   Give the 0810 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  

5. At 0830 you fix your position 007°T, 1.7 nm from Mill stack. You steer 278°T at 4.0 kn until 0905, then 331°T at 8.2 kn until 0915.

   Give the 0915 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 1315 you fix your position 063°T, 4.4 nm from Tern Island tower. You steer 170°T at 6.0 kn until 1355, then 359°T at 4.0 kn until 1440.

   Give the 1440 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 1105 you fix your position 022°T, 2.9 nm from Heron Point Light. You steer 014°T at 5.1 kn until 1145, then 200°T at 8.6 kn until 1215.

   Give the 1215 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 1150 you fix your position 002°T, 1.6 nm from Tern Island tower. You steer 112°T at 9.8 kn until 1210, then 163°T at 5.0 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