Worksheet 10 · Skill 3

Dead reckoning

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1. At 0740 you fix your position 100°T, 1.4 nm from Westfield church spire. You steer 176°T at 8.1 kn until 0755, then 035°T at 7.0 kn until 0805.

   Give the 0805 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  

2. At 0910 you fix your position 035°T, 1.4 nm from Gannet Rock daybeacon. You steer 338°T at 6.3 kn until 0940, then 101°T at 6.7 kn until 0955.

   Give the 0955 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 1040 you fix your position 023°T, 2.4 nm from Gannet Rock daybeacon. You steer 133°T at 5.8 kn until 1110, then 250°T at 6.7 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  

4. At 0755 you fix your position 166°T, 1.5 nm from Gannet Rock daybeacon. You steer 066°T at 6.4 kn until 0820, then 318°T at 8.3 kn until 0835.

   Give the 0835 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 0945 you fix your position 067°T, 3.2 nm from Westfield church spire. You steer 121°T at 4.2 kn until 1025, then 310°T at 8.2 kn until 1050.

   Give the 1050 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  

6. At 1515 you fix your position 062°T, 2.6 nm from Heron Point Light. You steer 350°T at 4.7 kn until 1555, then 166°T at 5.3 kn until 1620.

   Give the 1620 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  

7. At 1025 you fix your position 031°T, 1.9 nm from Mill stack. You steer 271°T at 7.2 kn until 1035, then 002°T at 8.2 kn until 1055.

   Give the 1055 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 0820 you fix your position 005°T, 1.7 nm from Heron Point Light. You steer 029°T at 4.8 kn until 0855, then 210°T at 5.3 kn until 0910.

   Give the 0910 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