Worksheet 788 · Skill 3

Dead reckoning

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1. At 1440 you fix your position 356°T, 2.5 nm from Tern Island tower. You steer 239°T at 9.1 kn until 1525, then 203°T at 4.6 kn until 1535.

   Give the 1535 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 1510 you fix your position 083°T, 3.5 nm from Westfield church spire. You steer 312°T at 6.2 kn until 1525, then 153°T at 6.2 kn until 1550.

   Give the 1550 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 1140 you fix your position 317°T, 1.7 nm from Tern Island tower. You steer 088°T at 7.8 kn until 1205, then 279°T at 9.1 kn until 1240.

   Give the 1240 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 0830 you fix your position 350°T, 1.3 nm from Gannet Rock daybeacon. You steer 118°T at 7.0 kn until 0850, then 027°T at 5.6 kn until 0900.

   Give the 0900 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  

5. At 0910 you fix your position 271°T, 1.9 nm from Gannet Rock daybeacon. You steer 240°T at 7.7 kn until 0930, then 046°T at 4.2 kn until 0950.

   Give the 0950 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 1225 you fix your position 056°T, 3.9 nm from Westfield church spire. You steer 065°T at 6.1 kn until 1250, then 120°T at 4.4 kn until 1300.

   Give the 1300 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 0700 you fix your position 356°T, 2.4 nm from Mill stack. You steer 006°T at 8.6 kn until 0735, then 234°T at 7.5 kn until 0805.

   Give the 0805 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 0925 you fix your position 095°T, 2.3 nm from Westfield church spire. You steer 252°T at 7.1 kn until 0940, then 049°T at 6.5 kn until 1015.

   Give the 1015 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