Worksheet 19 · Skill 3

Dead reckoning

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1. At 1120 you fix your position 102°T, 2.4 nm from Gannet Rock daybeacon. You steer 250°T at 9.4 kn until 1155, then 295°T at 7.3 kn until 1235.

   Give the 1235 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 0940 you fix your position 298°T, 1.4 nm from Gannet Rock daybeacon. You steer 036°T at 5.8 kn until 1005, then 315°T at 5.2 kn until 1020.

   Give the 1020 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 0945 you fix your position 022°T, 2.4 nm from Mill stack. You steer 312°T at 5.0 kn until 1030, then 272°T at 5.7 kn until 1050.

   Give the 1050 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 0725 you fix your position 275°T, 2.9 nm from Tern Island tower. You steer 263°T at 6.5 kn until 0740, then 176°T at 5.8 kn until 0820.

   Give the 0820 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 1020 you fix your position 024°T, 2.3 nm from Heron Point Light. You steer 341°T at 8.6 kn until 1045, then 229°T at 6.9 kn until 1055.

   Give the 1055 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  

6. At 1440 you fix your position 053°T, 1.6 nm from Westfield church spire. You steer 147°T at 5.1 kn until 1505, then 032°T at 6.3 kn until 1545.

   Give the 1545 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  

7. At 1330 you fix your position 034°T, 1.8 nm from Gannet Rock daybeacon. You steer 189°T at 8.3 kn until 1345, then 056°T at 4.6 kn until 1425.

   Give the 1425 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 0935 you fix your position 023°T, 1.9 nm from Gannet Rock daybeacon. You steer 172°T at 9.3 kn until 0955, then 337°T at 7.8 kn until 1010.

   Give the 1010 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