Worksheet 704 · Skill 3

Dead reckoning

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1. At 0935 you fix your position 071°T, 3.1 nm from Westfield church spire. You steer 012°T at 6.3 kn until 1000, then 226°T at 5.6 kn until 1025.

   Give the 1025 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 0700 you fix your position 212°T, 3.0 nm from Tern Island tower. You steer 316°T at 5.1 kn until 0720, then 109°T at 4.7 kn until 0750.

   Give the 0750 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 1045 you fix your position 091°T, 1.1 nm from Heron Point Light. You steer 089°T at 4.9 kn until 1055, then 311°T at 4.2 kn until 1135.

   Give the 1135 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 1545 you fix your position 058°T, 3.4 nm from Gannet Rock daybeacon. You steer 243°T at 5.9 kn until 1610, then 136°T at 5.7 kn until 1630.

   Give the 1630 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 1200 you fix your position 034°T, 2.3 nm from Heron Point Light. You steer 000°T at 8.4 kn until 1225, then 086°T at 4.3 kn until 1305.

   Give the 1305 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  

6. At 0725 you fix your position 080°T, 1.4 nm from Westfield church spire. You steer 156°T at 4.3 kn until 0745, then 350°T at 5.3 kn until 0805.

   Give the 0805 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 1305 you fix your position 013°T, 2.2 nm from Mill stack. You steer 039°T at 9.0 kn until 1315, then 320°T at 6.8 kn until 1350.

   Give the 1350 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 0840 you fix your position 119°T, 1.7 nm from Gannet Rock daybeacon. You steer 239°T at 4.6 kn until 0855, then 018°T at 7.0 kn until 0935.

   Give the 0935 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