Worksheet 440 · Skill 3

Dead reckoning

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1. At 0735 you fix your position 066°T, 2.8 nm from Heron Point Light. You steer 355°T at 6.1 kn until 0745, then 081°T at 5.7 kn until 0810.

   Give the 0810 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  

2. At 1410 you fix your position 024°T, 2.1 nm from Heron Point Light. You steer 037°T at 4.5 kn until 1440, then 236°T at 4.2 kn until 1525.

   Give the 1525 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  

3. At 1145 you fix your position 253°T, 2.9 nm from Gannet Rock daybeacon. You steer 094°T at 5.2 kn until 1155, then 274°T at 7.1 kn until 1215.

   Give the 1215 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

4. At 0705 you fix your position 238°T, 1.4 nm from Tern Island tower. You steer 337°T at 8.1 kn until 0715, then 186°T at 7.5 kn until 0755.

   Give the 0755 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

5. At 1055 you fix your position 074°T, 3.2 nm from Tern Island tower. You steer 203°T at 8.3 kn until 1105, then 015°T at 6.6 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  

6. At 0725 you fix your position 078°T, 3.5 nm from Tern Island tower. You steer 237°T at 6.4 kn until 0740, then 184°T at 7.8 kn until 0755.

   Give the 0755 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  

7. At 0905 you fix your position 038°T, 3.9 nm from Gannet Rock daybeacon. You steer 026°T at 9.9 kn until 0915, then 199°T at 6.7 kn until 0940.

   Give the 0940 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  

8. At 1310 you fix your position 063°T, 3.0 nm from Gannet Rock daybeacon. You steer 223°T at 7.0 kn until 1325, then 326°T at 7.8 kn until 1405.

   Give the 1405 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