Worksheet 715 · Skill 3

Dead reckoning

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1. At 0850 you fix your position 063°T, 1.6 nm from Heron Point Light. You steer 305°T at 4.4 kn until 0935, then 118°T at 8.8 kn until 0945.

   Give the 0945 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 0750 you fix your position 009°T, 2.5 nm from Mill stack. You steer 045°T at 9.7 kn until 0825, then 095°T at 5.0 kn until 0845.

   Give the 0845 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 0900 you fix your position 270°T, 3.2 nm from Tern Island tower. You steer 289°T at 6.1 kn until 0920, then 166°T at 6.6 kn until 0930.

   Give the 0930 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  

4. At 0920 you fix your position 243°T, 3.5 nm from Tern Island tower. You steer 100°T at 4.4 kn until 0940, then 058°T at 6.7 kn until 0950.

   Give the 0950 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  

5. At 0835 you fix your position 338°T, 1.8 nm from Tern Island tower. You steer 086°T at 8.1 kn until 0905, then 171°T at 5.6 kn until 0925.

   Give the 0925 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 1205 you fix your position 291°T, 2.0 nm from Tern Island tower. You steer 204°T at 8.6 kn until 1220, then 284°T at 7.1 kn until 1300.

   Give the 1300 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 0850 you fix your position 034°T, 2.7 nm from Heron Point Light. You steer 322°T at 8.0 kn until 0910, then 152°T at 4.1 kn until 0950.

   Give the 0950 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 0925 you fix your position 019°T, 1.3 nm from Tern Island tower. You steer 265°T at 5.3 kn until 1010, then 179°T at 7.6 kn until 1025.

   Give the 1025 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