Worksheet 14 · Skill 3

Dead reckoning

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1. At 0845 you fix your position 054°T, 2.6 nm from Mill stack. You steer 322°T at 6.8 kn until 0855, then 247°T at 6.4 kn until 0910.

   Give the 0910 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  

2. At 0730 you fix your position 099°T, 1.6 nm from Westfield church spire. You steer 066°T at 6.3 kn until 0800, then 327°T at 9.4 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  

3. At 1120 you fix your position 000°T, 1.7 nm from Mill stack. You steer 001°T at 4.6 kn until 1145, then 231°T at 6.0 kn until 1205.

   Give the 1205 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 1515 you fix your position 224°T, 2.9 nm from Tern Island tower. You steer 156°T at 8.3 kn until 1525, then 329°T at 9.1 kn until 1550.

   Give the 1550 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 1440 you fix your position 006°T, 2.3 nm from Heron Point Light. You steer 075°T at 6.6 kn until 1455, then 032°T at 5.8 kn until 1505.

   Give the 1505 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 1135 you fix your position 250°T, 2.8 nm from Tern Island tower. You steer 161°T at 4.5 kn until 1145, then 210°T at 5.5 kn until 1205.

   Give the 1205 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 1215 you fix your position 015°T, 0.9 nm from Gannet Rock daybeacon. You steer 038°T at 6.7 kn until 1255, then 233°T at 4.2 kn until 1320.

   Give the 1320 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 0815 you fix your position 244°T, 3.3 nm from Tern Island tower. You steer 234°T at 6.4 kn until 0835, then 062°T at 4.0 kn until 0845.

   Give the 0845 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