Worksheet 54 · Skill 3

Dead reckoning

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1. At 0710 you fix your position 012°T, 2.4 nm from Heron Point Light. You steer 039°T at 7.1 kn until 0735, then 310°T at 4.5 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  

2. At 0825 you fix your position 060°T, 3.9 nm from Westfield church spire. You steer 162°T at 5.1 kn until 0905, then 312°T at 7.1 kn until 0945.

   Give the 0945 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  

3. At 1330 you fix your position 034°T, 2.1 nm from Tern Island tower. You steer 118°T at 5.3 kn until 1405, then 282°T at 6.8 kn until 1435.

   Give the 1435 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 0825 you fix your position 052°T, 2.4 nm from Heron Point Light. You steer 036°T at 8.0 kn until 0845, then 106°T at 7.4 kn until 0920.

   Give the 0920 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 1100 you fix your position 201°T, 1.5 nm from Tern Island tower. You steer 095°T at 6.1 kn until 1125, then 020°T at 5.6 kn until 1140.

   Give the 1140 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  

6. At 0800 you fix your position 051°T, 2.8 nm from Heron Point Light. You steer 219°T at 5.3 kn until 0815, then 050°T at 5.3 kn until 0850.

   Give the 0850 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 1045 you fix your position 051°T, 1.9 nm from Gannet Rock daybeacon. You steer 302°T at 9.2 kn until 1055, then 241°T at 9.1 kn until 1120.

   Give the 1120 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 1415 you fix your position 014°T, 1.0 nm from Heron Point Light. You steer 054°T at 4.9 kn until 1440, then 178°T at 6.5 kn until 1505.

   Give the 1505 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