Worksheet 158 · Skill 3

Dead reckoning

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1. At 0805 you fix your position 150°T, 1.7 nm from Westfield church spire. You steer 126°T at 4.3 kn until 0840, then 335°T at 4.7 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  

2. At 0855 you fix your position 095°T, 2.1 nm from Tern Island tower. You steer 174°T at 6.5 kn until 0930, then 142°T at 6.5 kn until 0940.

   Give the 0940 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 1410 you fix your position 005°T, 1.7 nm from Gannet Rock daybeacon. You steer 096°T at 7.8 kn until 1420, then 188°T at 5.4 kn until 1430.

   Give the 1430 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  

4. At 0955 you fix your position 004°T, 1.5 nm from Kittle water tank. You steer 258°T at 4.5 kn until 1030, then 307°T at 8.0 kn until 1105.

   Give the 1105 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 1515 you fix your position 246°T, 2.7 nm from Tern Island tower. You steer 325°T at 8.2 kn until 1545, then 109°T at 9.1 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  

6. At 1130 you fix your position 068°T, 2.1 nm from Heron Point Light. You steer 080°T at 5.7 kn until 1140, then 356°T at 7.4 kn until 1200.

   Give the 1200 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 1110 you fix your position 237°T, 3.4 nm from Tern Island tower. You steer 165°T at 8.2 kn until 1125, then 239°T at 7.4 kn until 1140.

   Give the 1140 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  

8. At 0945 you fix your position 246°T, 3.0 nm from Tern Island tower. You steer 117°T at 8.8 kn until 1020, then 301°T at 9.9 kn until 1035.

   Give the 1035 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