Worksheet 659 · Skill 3

Dead reckoning

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1. At 1355 you fix your position 063°T, 1.5 nm from Tern Island tower. You steer 156°T at 6.9 kn until 1415, then 071°T at 6.4 kn until 1440.

   Give the 1440 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  

2. At 1410 you fix your position 262°T, 2.9 nm from Gannet Rock daybeacon. You steer 119°T at 7.6 kn until 1420, then 081°T at 7.1 kn until 1440.

   Give the 1440 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 0735 you fix your position 242°T, 2.6 nm from Tern Island tower. You steer 005°T at 5.9 kn until 0750, then 193°T at 5.3 kn until 0815.

   Give the 0815 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 1315 you fix your position 088°T, 1.4 nm from Heron Point Light. You steer 110°T at 7.4 kn until 1330, then 269°T at 7.6 kn until 1340.

   Give the 1340 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 1455 you fix your position 215°T, 1.8 nm from Gannet Rock daybeacon. You steer 230°T at 8.6 kn until 1505, then 335°T at 6.4 kn until 1530.

   Give the 1530 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 1030 you fix your position 261°T, 2.7 nm from Gannet Rock daybeacon. You steer 081°T at 4.3 kn until 1050, then 023°T at 5.6 kn until 1100.

   Give the 1100 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 1235 you fix your position 194°T, 1.9 nm from Tern Island tower. You steer 167°T at 7.4 kn until 1245, then 318°T at 9.4 kn until 1300.

   Give the 1300 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 1050 you fix your position 038°T, 4.3 nm from Westfield church spire. You steer 126°T at 7.3 kn until 1110, then 171°T at 5.7 kn until 1120.

   Give the 1120 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