Worksheet 739 · Skill 3

Dead reckoning

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1. At 1005 you fix your position 229°T, 1.5 nm from Tern Island tower. You steer 231°T at 4.5 kn until 1025, then 355°T at 4.1 kn until 1035.

   Give the 1035 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  

2. At 0855 you fix your position 060°T, 2.6 nm from Westfield church spire. You steer 122°T at 6.8 kn until 0915, then 027°T at 6.8 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  

3. At 0925 you fix your position 023°T, 2.6 nm from Tern Island tower. You steer 139°T at 9.0 kn until 0950, then 079°T at 9.9 kn until 1000.

   Give the 1000 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 0850 you fix your position 122°T, 1.8 nm from Westfield church spire. You steer 159°T at 8.9 kn until 0900, then 100°T at 8.7 kn until 0915.

   Give the 0915 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  

5. At 1230 you fix your position 034°T, 2.9 nm from Tern Island tower. You steer 248°T at 6.6 kn until 1310, then 321°T at 5.2 kn until 1330.

   Give the 1330 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 1155 you fix your position 310°T, 1.5 nm from Tern Island tower. You steer 198°T at 4.0 kn until 1225, then 342°T at 8.8 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  

7. At 0735 you fix your position 066°T, 3.8 nm from Tern Island tower. You steer 163°T at 8.3 kn until 0755, then 323°T at 6.9 kn until 0815.

   Give the 0815 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  

8. At 1150 you fix your position 348°T, 2.3 nm from Mill stack. You steer 330°T at 9.8 kn until 1225, then 111°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