Worksheet 766 · Skill 3

Dead reckoning

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1. At 1110 you fix your position 040°T, 2.0 nm from Mill stack. You steer 306°T at 7.1 kn until 1155, then 100°T at 6.8 kn until 1220.

   Give the 1220 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 0905 you fix your position 073°T, 3.1 nm from Gannet Rock daybeacon. You steer 299°T at 9.4 kn until 0915, then 191°T at 4.0 kn until 0945.

   Give the 0945 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 0715 you fix your position 286°T, 2.6 nm from Tern Island tower. You steer 214°T at 4.9 kn until 0755, then 161°T at 8.3 kn until 0810.

   Give the 0810 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 1440 you fix your position 054°T, 4.1 nm from Westfield church spire. You steer 330°T at 5.5 kn until 1450, then 141°T at 4.1 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  

5. At 1500 you fix your position 297°T, 3.4 nm from Tern Island tower. You steer 102°T at 4.2 kn until 1510, then 172°T at 5.2 kn until 1525.

   Give the 1525 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 0920 you fix your position 016°T, 2.4 nm from Heron Point Light. You steer 072°T at 8.0 kn until 0935, then 290°T at 6.9 kn until 0950.

   Give the 0950 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 1155 you fix your position 006°T, 1.3 nm from Gannet Rock daybeacon. You steer 354°T at 8.6 kn until 1215, then 132°T at 9.3 kn until 1225.

   Give the 1225 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 1450 you fix your position 018°T, 2.3 nm from Heron Point Light. You steer 048°T at 6.1 kn until 1505, then 243°T at 6.3 kn until 1530.

   Give the 1530 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