Worksheet 395 · Skill 3

Dead reckoning

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1. At 0720 you fix your position 253°T, 2.8 nm from Gannet Rock daybeacon. You steer 220°T at 4.5 kn until 0745, then 333°T at 8.4 kn until 0815.

   Give the 0815 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  

2. At 1155 you fix your position 082°T, 2.5 nm from Gannet Rock daybeacon. You steer 316°T at 6.9 kn until 1205, then 183°T at 8.1 kn until 1220.

   Give the 1220 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 0705 you fix your position 047°T, 1.2 nm from Heron Point Light. You steer 088°T at 8.9 kn until 0715, then 327°T at 5.6 kn until 0740.

   Give the 0740 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 1550 you fix your position 013°T, 2.9 nm from Mill stack. You steer 012°T at 4.6 kn until 1600, then 253°T at 4.0 kn until 1625.

   Give the 1625 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 1400 you fix your position 028°T, 2.4 nm from Gannet Rock daybeacon. You steer 163°T at 9.4 kn until 1425, then 275°T at 6.7 kn until 1455.

   Give the 1455 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  

6. At 1555 you fix your position 059°T, 1.6 nm from Heron Point Light. You steer 045°T at 6.3 kn until 1635, then 220°T at 6.8 kn until 1655.

   Give the 1655 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 0715 you fix your position 302°T, 2.1 nm from Tern Island tower. You steer 164°T at 5.1 kn until 0730, then 246°T at 5.4 kn until 0740.

   Give the 0740 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  

8. At 0740 you fix your position 299°T, 2.0 nm from Tern Island tower. You steer 269°T at 6.8 kn until 0820, then 065°T at 6.4 kn until 0855.

   Give the 0855 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