Worksheet 306 · Skill 3

Dead reckoning

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1. At 0840 you fix your position 262°T, 3.4 nm from Tern Island tower. You steer 001°T at 5.3 kn until 0900, then 139°T at 6.7 kn until 0910.

   Give the 0910 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  

2. At 1345 you fix your position 234°T, 1.8 nm from Gannet Rock daybeacon. You steer 318°T at 9.3 kn until 1430, then 144°T at 5.7 kn until 1455.

   Give the 1455 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 1600 you fix your position 123°T, 1.7 nm from Westfield church spire. You steer 038°T at 4.8 kn until 1635, then 115°T at 6.8 kn until 1700.

   Give the 1700 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 0825 you fix your position 028°T, 2.2 nm from Heron Point Light. You steer 001°T at 5.4 kn until 0900, then 309°T at 8.8 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  

5. At 0945 you fix your position 064°T, 2.6 nm from Heron Point Light. You steer 209°T at 5.8 kn until 1000, then 320°T at 4.8 kn until 1030.

   Give the 1030 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 0805 you fix your position 267°T, 1.3 nm from Gannet Rock daybeacon. You steer 280°T at 6.6 kn until 0815, then 141°T at 8.2 kn until 0825.

   Give the 0825 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 0840 you fix your position 291°T, 3.4 nm from Tern Island tower. You steer 237°T at 6.7 kn until 0915, then 153°T at 4.9 kn until 0940.

   Give the 0940 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 0900 you fix your position 032°T, 3.6 nm from Heron Point Light. You steer 003°T at 7.2 kn until 0910, then 294°T at 8.1 kn until 0935.

   Give the 0935 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