Worksheet 129 · Skill 3

Dead reckoning

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1. At 1030 you fix your position 019°T, 2.7 nm from Heron Point Light. You steer 002°T at 4.3 kn until 1105, then 293°T at 4.9 kn until 1130.

   Give the 1130 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 1430 you fix your position 145°T, 1.4 nm from Westfield church spire. You steer 090°T at 6.8 kn until 1515, then 332°T at 9.9 kn until 1540.

   Give the 1540 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 0825 you fix your position 352°T, 2.9 nm from Mill stack. You steer 328°T at 4.1 kn until 0855, then 157°T at 4.0 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  

4. At 0710 you fix your position 028°T, 3.1 nm from Heron Point Light. You steer 183°T at 8.2 kn until 0720, then 105°T at 5.8 kn until 0805.

   Give the 0805 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 0800 you fix your position 102°T, 1.5 nm from Westfield church spire. You steer 099°T at 5.6 kn until 0845, then 207°T at 8.8 kn until 0900.

   Give the 0900 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  

6. At 1325 you fix your position 300°T, 2.0 nm from Kittle water tank. You steer 347°T at 7.6 kn until 1335, then 257°T at 5.6 kn until 1355.

   Give the 1355 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 0825 you fix your position 260°T, 2.2 nm from Gannet Rock daybeacon. You steer 339°T at 4.7 kn until 0905, then 224°T at 8.1 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 1320 you fix your position 202°T, 1.1 nm from Gannet Rock daybeacon. You steer 155°T at 5.6 kn until 1335, then 289°T at 4.9 kn until 1405.

   Give the 1405 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