Worksheet 134 · Skill 3

Dead reckoning

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1. At 0705 you fix your position 245°T, 3.0 nm from Tern Island tower. You steer 184°T at 9.1 kn until 0715, then 326°T at 5.3 kn until 0730.

   Give the 0730 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 0725 you fix your position 149°T, 1.0 nm from Westfield church spire. You steer 099°T at 5.3 kn until 0750, then 037°T at 9.2 kn until 0805.

   Give the 0805 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 0915 you fix your position 087°T, 2.2 nm from Westfield church spire. You steer 123°T at 5.2 kn until 0925, then 052°T at 9.6 kn until 0955.

   Give the 0955 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 1400 you fix your position 161°T, 1.5 nm from Gannet Rock daybeacon. You steer 284°T at 5.3 kn until 1445, then 133°T at 6.9 kn until 1500.

   Give the 1500 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  

5. At 1555 you fix your position 072°T, 1.8 nm from Heron Point Light. You steer 299°T at 6.4 kn until 1625, then 106°T at 6.1 kn until 1700.

   Give the 1700 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 0835 you fix your position 075°T, 4.1 nm from Tern Island tower. You steer 178°T at 8.0 kn until 0855, then 232°T at 8.9 kn until 0925.

   Give the 0925 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  

7. At 1500 you fix your position 249°T, 1.8 nm from Gannet Rock daybeacon. You steer 085°T at 7.8 kn until 1535, then 002°T at 4.6 kn until 1610.

   Give the 1610 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  

8. At 1205 you fix your position 209°T, 2.2 nm from Tern Island tower. You steer 258°T at 9.0 kn until 1225, then 056°T at 5.3 kn until 1255.

   Give the 1255 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