Worksheet 376 · Skill 3

Dead reckoning

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1. At 1510 you fix your position 086°T, 2.6 nm from Westfield church spire. You steer 350°T at 9.6 kn until 1530, then 189°T at 5.9 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  

2. At 0710 you fix your position 073°T, 1.8 nm from Heron Point Light. You steer 025°T at 5.4 kn until 0725, then 168°T at 7.8 kn until 0735.

   Give the 0735 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  

3. At 0900 you fix your position 057°T, 2.1 nm from Heron Point Light. You steer 287°T at 4.3 kn until 0940, then 077°T at 7.9 kn until 0955.

   Give the 0955 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 1145 you fix your position 089°T, 2.1 nm from Tern Island tower. You steer 061°T at 6.1 kn until 1215, then 292°T at 8.6 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  

5. At 1450 you fix your position 320°T, 3.1 nm from Tern Island tower. You steer 262°T at 5.6 kn until 1520, then 152°T at 9.1 kn until 1535.

   Give the 1535 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 1400 you fix your position 034°T, 3.6 nm from Gannet Rock daybeacon. You steer 251°T at 8.1 kn until 1410, then 155°T at 4.1 kn until 1440.

   Give the 1440 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  

7. At 1435 you fix your position 033°T, 2.3 nm from Heron Point Light. You steer 345°T at 7.8 kn until 1450, then 121°T at 7.8 kn until 1525.

   Give the 1525 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 1510 you fix your position 012°T, 2.4 nm from Westfield church spire. You steer 139°T at 6.8 kn until 1545, then 064°T at 4.1 kn until 1605.

   Give the 1605 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