Worksheet 452 · Skill 3

Dead reckoning

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1. At 0715 you fix your position 109°T, 1.6 nm from Westfield church spire. You steer 138°T at 5.5 kn until 0750, then 327°T at 5.0 kn until 0830.

   Give the 0830 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 0845 you fix your position 063°T, 2.9 nm from Tern Island tower. You steer 220°T at 5.7 kn until 0855, then 115°T at 4.6 kn until 0905.

   Give the 0905 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 306°T, 3.5 nm from Tern Island tower. You steer 278°T at 5.1 kn until 1110, then 114°T at 9.7 kn until 1130.

   Give the 1130 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 1035 you fix your position 093°T, 2.6 nm from Gannet Rock daybeacon. You steer 248°T at 8.2 kn until 1120, then 300°T at 8.3 kn until 1155.

   Give the 1155 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 1115 you fix your position 066°T, 2.3 nm from Gannet Rock daybeacon. You steer 226°T at 4.7 kn until 1155, then 337°T at 4.5 kn until 1220.

   Give the 1220 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 1225 you fix your position 276°T, 3.3 nm from Tern Island tower. You steer 283°T at 7.9 kn until 1255, then 143°T at 9.0 kn until 1330.

   Give the 1330 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  

7. At 1450 you fix your position 358°T, 1.3 nm from Gannet Rock daybeacon. You steer 010°T at 4.6 kn until 1525, then 275°T at 5.1 kn until 1555.

   Give the 1555 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 1555 you fix your position 348°T, 1.3 nm from Gannet Rock daybeacon. You steer 225°T at 4.6 kn until 1605, then 089°T at 8.9 kn until 1620.

   Give the 1620 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