Worksheet 540 · Skill 3

Dead reckoning

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1. At 1535 you fix your position 209°T, 2.6 nm from Tern Island tower. You steer 177°T at 4.2 kn until 1605, then 055°T at 9.6 kn until 1620.

   Give the 1620 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  

2. At 1015 you fix your position 057°T, 2.7 nm from Tern Island tower. You steer 193°T at 9.0 kn until 1045, then 129°T at 7.1 kn until 1055.

   Give the 1055 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  

3. At 1355 you fix your position 228°T, 2.5 nm from Gannet Rock daybeacon. You steer 312°T at 8.3 kn until 1440, then 146°T at 4.7 kn until 1515.

   Give the 1515 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 1250 you fix your position 289°T, 2.8 nm from Tern Island tower. You steer 188°T at 6.7 kn until 1320, then 087°T at 7.8 kn until 1350.

   Give the 1350 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 0800 you fix your position 320°T, 1.3 nm from Tern Island tower. You steer 011°T at 6.7 kn until 0810, then 130°T at 6.9 kn until 0820.

   Give the 0820 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  

6. At 1155 you fix your position 007°T, 1.5 nm from Westfield church spire. You steer 075°T at 7.0 kn until 1215, then 203°T at 5.3 kn until 1235.

   Give the 1235 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 0730 you fix your position 048°T, 2.4 nm from Heron Point Light. You steer 326°T at 9.0 kn until 0750, then 126°T at 10.0 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  

8. At 1000 you fix your position 320°T, 1.2 nm from Gannet Rock daybeacon. You steer 277°T at 5.6 kn until 1030, then 311°T at 9.4 kn until 1100.

   Give the 1100 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