Worksheet 166 · Skill 3

Dead reckoning

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1. At 0905 you fix your position 358°T, 3.4 nm from Mill stack. You steer 313°T at 4.0 kn until 0925, then 279°T at 5.7 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  

2. At 1500 you fix your position 330°T, 1.1 nm from Heron Point Light. You steer 343°T at 4.0 kn until 1510, then 129°T at 5.7 kn until 1545.

   Give the 1545 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 0835 you fix your position 337°T, 2.4 nm from Tern Island tower. You steer 212°T at 7.6 kn until 0920, then 286°T at 4.3 kn until 1000.

   Give the 1000 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  

4. At 1235 you fix your position 061°T, 3.7 nm from Westfield church spire. You steer 131°T at 5.3 kn until 1245, then 083°T at 4.4 kn until 1315.

   Give the 1315 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 1000 you fix your position 164°T, 0.9 nm from Gannet Rock daybeacon. You steer 143°T at 4.4 kn until 1015, then 265°T at 7.5 kn until 1055.

   Give the 1055 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  

6. At 1045 you fix your position 023°T, 2.4 nm from Westfield church spire. You steer 163°T at 7.9 kn until 1125, then 321°T at 8.8 kn until 1140.

   Give the 1140 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 1515 you fix your position 329°T, 2.6 nm from Tern Island tower. You steer 193°T at 7.6 kn until 1545, then 011°T at 4.5 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  

8. At 1015 you fix your position 151°T, 2.7 nm from Tern Island tower. You steer 214°T at 8.1 kn until 1040, then 043°T at 6.1 kn until 1105.

   Give the 1105 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