Worksheet 359 · Skill 3

Dead reckoning

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1. At 1535 you fix your position 043°T, 3.4 nm from Tern Island tower. You steer 244°T at 4.6 kn until 1620, then 007°T at 6.7 kn until 1630.

   Give the 1630 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 1310 you fix your position 228°T, 1.8 nm from Tern Island tower. You steer 225°T at 9.5 kn until 1320, then 269°T at 5.3 kn until 1350.

   Give the 1350 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 1010 you fix your position 071°T, 2.2 nm from Heron Point Light. You steer 315°T at 4.5 kn until 1045, then 155°T at 9.5 kn until 1105.

   Give the 1105 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 1515 you fix your position 350°T, 3.4 nm from Mill stack. You steer 130°T at 5.6 kn until 1535, then 088°T at 8.6 kn until 1600.

   Give the 1600 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 0810 you fix your position 006°T, 1.8 nm from Heron Point Light. You steer 011°T at 4.3 kn until 0830, then 173°T at 4.1 kn until 0910.

   Give the 0910 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  

6. At 0905 you fix your position 292°T, 2.4 nm from Tern Island tower. You steer 292°T at 6.5 kn until 0940, then 137°T at 5.9 kn until 0955.

   Give the 0955 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  

7. At 0835 you fix your position 034°T, 2.4 nm from Heron Point Light. You steer 048°T at 4.9 kn until 0915, then 324°T at 4.3 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  

8. At 1030 you fix your position 218°T, 3.0 nm from Tern Island tower. You steer 260°T at 4.4 kn until 1110, then 346°T at 6.6 kn until 1125.

   Give the 1125 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