Worksheet 168 · Skill 3

Dead reckoning

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1. At 1040 you fix your position 344°T, 2.7 nm from Mill stack. You steer 136°T at 9.6 kn until 1050, then 286°T at 4.3 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  

2. At 0935 you fix your position 074°T, 4.4 nm from Tern Island tower. You steer 243°T at 8.4 kn until 0955, then 212°T at 5.1 kn until 1005.

   Give the 1005 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 0840 you fix your position 033°T, 1.6 nm from Kittle water tank. You steer 354°T at 8.5 kn until 0915, then 317°T at 5.0 kn until 0935.

   Give the 0935 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 1515 you fix your position 346°T, 3.0 nm from Mill stack. You steer 019°T at 7.6 kn until 1540, then 226°T at 4.2 kn until 1620.

   Give the 1620 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  

5. At 1450 you fix your position 042°T, 2.7 nm from Tern Island tower. You steer 147°T at 8.0 kn until 1520, then 218°T at 5.1 kn until 1535.

   Give the 1535 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 0720 you fix your position 064°T, 1.8 nm from Westfield church spire. You steer 083°T at 4.2 kn until 0735, then 196°T at 4.3 kn until 0805.

   Give the 0805 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  

7. At 1305 you fix your position 053°T, 3.8 nm from Westfield church spire. You steer 226°T at 7.7 kn until 1315, then 319°T at 6.1 kn until 1325.

   Give the 1325 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  

8. At 0715 you fix your position 057°T, 2.4 nm from Heron Point Light. You steer 151°T at 7.4 kn until 0730, then 047°T at 6.1 kn until 0740.

   Give the 0740 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