Worksheet 378 · Skill 3

Dead reckoning

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1. At 1405 you fix your position 224°T, 2.0 nm from Gannet Rock daybeacon. You steer 242°T at 4.3 kn until 1440, then 322°T at 4.4 kn until 1500.

   Give the 1500 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  

2. At 1555 you fix your position 095°T, 3.4 nm from Westfield church spire. You steer 022°T at 9.9 kn until 1610, then 175°T at 9.5 kn until 1645.

   Give the 1645 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  

3. At 1235 you fix your position 034°T, 3.2 nm from Heron Point Light. You steer 302°T at 5.4 kn until 1300, then 355°T at 4.9 kn until 1335.

   Give the 1335 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 0840 you fix your position 224°T, 3.1 nm from Tern Island tower. You steer 012°T at 9.2 kn until 0900, then 251°T at 5.6 kn until 0935.

   Give the 0935 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  

5. At 1230 you fix your position 295°T, 2.7 nm from Tern Island tower. You steer 206°T at 6.2 kn until 1315, then 054°T at 5.2 kn until 1330.

   Give the 1330 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 0810 you fix your position 029°T, 2.7 nm from Gannet Rock daybeacon. You steer 221°T at 9.9 kn until 0830, then 182°T at 4.8 kn until 0855.

   Give the 0855 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 0935 you fix your position 213°T, 2.5 nm from Tern Island tower. You steer 268°T at 4.7 kn until 1010, then 223°T at 6.1 kn until 1020.

   Give the 1020 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 1200 you fix your position 303°T, 3.3 nm from Tern Island tower. You steer 142°T at 4.1 kn until 1225, then 224°T at 8.7 kn until 1250.

   Give the 1250 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