Worksheet 85 · Skill 3

Dead reckoning

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1. At 0740 you fix your position 306°T, 3.6 nm from Tern Island tower. You steer 183°T at 8.5 kn until 0800, then 262°T at 4.5 kn until 0825.

   Give the 0825 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 0955 you fix your position 245°T, 1.6 nm from Gannet Rock daybeacon. You steer 264°T at 6.0 kn until 1005, then 327°T at 8.1 kn until 1025.

   Give the 1025 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  

3. At 0720 you fix your position 005°T, 3.3 nm from Westfield church spire. You steer 126°T at 4.3 kn until 0750, then 174°T at 6.1 kn until 0825.

   Give the 0825 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 0955 you fix your position 077°T, 2.4 nm from Heron Point Light. You steer 057°T at 8.7 kn until 1035, then 224°T at 6.2 kn until 1110.

   Give the 1110 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 1330 you fix your position 047°T, 1.5 nm from Westfield church spire. You steer 110°T at 6.4 kn until 1345, then 224°T at 4.9 kn until 1400.

   Give the 1400 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 0935 you fix your position 066°T, 2.8 nm from Westfield church spire. You steer 196°T at 4.3 kn until 0945, then 127°T at 6.7 kn until 1025.

   Give the 1025 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  

7. At 1330 you fix your position 264°T, 3.4 nm from Tern Island tower. You steer 142°T at 9.9 kn until 1355, then 248°T at 7.9 kn until 1410.

   Give the 1410 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  

8. At 0900 you fix your position 336°T, 2.2 nm from Mill stack. You steer 051°T at 8.5 kn until 0940, then 248°T at 6.4 kn until 1015.

   Give the 1015 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