Worksheet 3 · Skill 3

Dead reckoning

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1. At 1515 you fix your position 175°T, 1.0 nm from Gannet Rock daybeacon. You steer 316°T at 5.8 kn until 1540, then 248°T at 8.1 kn until 1605.

   Give the 1605 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 0820 you fix your position 249°T, 2.2 nm from Tern Island tower. You steer 270°T at 7.1 kn until 0840, then 150°T at 6.6 kn until 0855.

   Give the 0855 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 1135 you fix your position 070°T, 2.9 nm from Westfield church spire. You steer 316°T at 8.9 kn until 1145, then 144°T at 9.1 kn until 1205.

   Give the 1205 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 1325 you fix your position 348°T, 3.2 nm from Mill stack. You steer 314°T at 8.4 kn until 1340, then 117°T at 5.0 kn until 1355.

   Give the 1355 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 1040 you fix your position 023°T, 0.8 nm from Gannet Rock daybeacon. You steer 139°T at 7.1 kn until 1105, then 263°T at 8.8 kn until 1140.

   Give the 1140 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 1205 you fix your position 308°T, 2.6 nm from Tern Island tower. You steer 279°T at 4.1 kn until 1215, then 172°T at 5.4 kn until 1245.

   Give the 1245 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 1300 you fix your position 045°T, 2.7 nm from Heron Point Light. You steer 182°T at 5.0 kn until 1325, then 335°T at 5.5 kn until 1335.

   Give the 1335 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 1300 you fix your position 259°T, 3.4 nm from Tern Island tower. You steer 134°T at 5.7 kn until 1340, then 200°T at 7.2 kn until 1355.

   Give the 1355 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