Worksheet 760 · Skill 3

Dead reckoning

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1. At 0830 you fix your position 089°T, 3.5 nm from Westfield church spire. You steer 307°T at 8.5 kn until 0900, then 130°T at 6.8 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  

2. At 1145 you fix your position 264°T, 2.3 nm from Gannet Rock daybeacon. You steer 305°T at 4.9 kn until 1225, then 063°T at 7.0 kn until 1240.

   Give the 1240 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 0835 you fix your position 119°T, 1.1 nm from Gannet Rock daybeacon. You steer 094°T at 6.6 kn until 0850, then 249°T at 9.8 kn until 0915.

   Give the 0915 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 1110 you fix your position 085°T, 1.0 nm from Heron Point Light. You steer 116°T at 5.1 kn until 1135, then 304°T at 9.6 kn until 1150.

   Give the 1150 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  

5. At 1520 you fix your position 076°T, 1.6 nm from Gannet Rock daybeacon. You steer 337°T at 4.6 kn until 1555, then 209°T at 7.4 kn until 1635.

   Give the 1635 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  

6. At 1520 you fix your position 314°T, 1.7 nm from Tern Island tower. You steer 359°T at 8.3 kn until 1530, then 266°T at 8.4 kn until 1605.

   Give the 1605 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  

7. At 1520 you fix your position 030°T, 3.3 nm from Gannet Rock daybeacon. You steer 271°T at 6.1 kn until 1540, then 074°T at 6.5 kn until 1550.

   Give the 1550 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 0810 you fix your position 085°T, 1.2 nm from Gannet Rock daybeacon. You steer 340°T at 9.1 kn until 0820, then 027°T at 6.2 kn until 0850.

   Give the 0850 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