Worksheet 110 · Skill 3

Dead reckoning

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1. At 1200 you fix your position 064°T, 3.2 nm from Westfield church spire. You steer 082°T at 5.0 kn until 1215, then 295°T at 9.1 kn until 1225.

   Give the 1225 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 1415 you fix your position 056°T, 1.1 nm from Heron Point Light. You steer 049°T at 6.3 kn until 1435, then 352°T at 8.2 kn until 1445.

   Give the 1445 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 1535 you fix your position 045°T, 2.2 nm from Tern Island tower. You steer 082°T at 5.0 kn until 1600, then 185°T at 6.7 kn until 1635.

   Give the 1635 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 1335 you fix your position 100°T, 2.3 nm from Westfield church spire. You steer 131°T at 8.1 kn until 1405, then 013°T at 6.5 kn until 1430.

   Give the 1430 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 1145 you fix your position 144°T, 1.9 nm from Westfield church spire. You steer 087°T at 6.2 kn until 1215, then 178°T at 5.4 kn until 1225.

   Give the 1225 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 0950 you fix your position 245°T, 2.7 nm from Gannet Rock daybeacon. You steer 285°T at 6.3 kn until 1010, then 090°T at 9.3 kn until 1025.

   Give the 1025 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 1020 you fix your position 004°T, 2.1 nm from Heron Point Light. You steer 080°T at 5.5 kn until 1100, then 213°T at 5.5 kn until 1125.

   Give the 1125 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  

8. At 1240 you fix your position 158°T, 3.2 nm from Tern Island tower. You steer 329°T at 4.9 kn until 1255, then 231°T at 4.3 kn until 1335.

   Give the 1335 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