Worksheet 430 · Skill 3

Dead reckoning

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1. At 1400 you fix your position 310°T, 2.1 nm from Tern Island tower. You steer 196°T at 9.6 kn until 1425, then 085°T at 4.5 kn until 1455.

   Give the 1455 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 0815 you fix your position 277°T, 2.9 nm from Tern Island tower. You steer 154°T at 4.5 kn until 0840, then 234°T at 7.3 kn until 0850.

   Give the 0850 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 1340 you fix your position 048°T, 3.5 nm from Westfield church spire. You steer 126°T at 7.4 kn until 1425, then 046°T at 6.4 kn until 1445.

   Give the 1445 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 1005 you fix your position 012°T, 1.6 nm from Mill stack. You steer 279°T at 7.8 kn until 1020, then 050°T at 8.6 kn until 1055.

   Give the 1055 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 1530 you fix your position 143°T, 1.5 nm from Westfield church spire. You steer 080°T at 4.0 kn until 1540, then 287°T at 6.2 kn until 1550.

   Give the 1550 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  

6. At 0835 you fix your position 023°T, 2.3 nm from Mill stack. You steer 256°T at 8.1 kn until 0850, then 295°T at 4.5 kn until 0905.

   Give the 0905 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 0925 you fix your position 101°T, 2.2 nm from Westfield church spire. You steer 345°T at 9.7 kn until 0935, then 264°T at 6.7 kn until 0945.

   Give the 0945 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  

8. At 1155 you fix your position 055°T, 3.3 nm from Tern Island tower. You steer 098°T at 4.0 kn until 1225, then 208°T at 6.1 kn until 1305.

   Give the 1305 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