Worksheet 399 · Skill 3

Dead reckoning

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1. At 1200 you fix your position 274°T, 2.9 nm from Tern Island tower. You steer 309°T at 4.7 kn until 1235, then 088°T at 4.6 kn until 1310.

   Give the 1310 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  

2. At 1540 you fix your position 218°T, 2.0 nm from Tern Island tower. You steer 203°T at 6.6 kn until 1600, then 066°T at 9.0 kn until 1645.

   Give the 1645 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 0720 you fix your position 196°T, 2.4 nm from Tern Island tower. You steer 176°T at 7.7 kn until 0735, then 265°T at 4.2 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  

4. At 1525 you fix your position 030°T, 2.7 nm from Gannet Rock daybeacon. You steer 316°T at 4.8 kn until 1545, then 109°T at 4.7 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  

5. At 1250 you fix your position 065°T, 2.8 nm from Westfield church spire. You steer 131°T at 7.3 kn until 1320, then 200°T at 4.9 kn until 1345.

   Give the 1345 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 1430 you fix your position 047°T, 1.2 nm from Heron Point Light. You steer 101°T at 5.4 kn until 1440, then 338°T at 4.3 kn until 1500.

   Give the 1500 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 1250 you fix your position 044°T, 2.2 nm from Westfield church spire. You steer 123°T at 5.1 kn until 1325, then 306°T at 8.0 kn until 1340.

   Give the 1340 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 1505 you fix your position 271°T, 1.5 nm from Gannet Rock daybeacon. You steer 222°T at 6.7 kn until 1530, then 300°T at 4.3 kn until 1550.

   Give the 1550 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