Worksheet 471 · Skill 3

Dead reckoning

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1. At 0815 you fix your position 089°T, 2.0 nm from Gannet Rock daybeacon. You steer 319°T at 4.4 kn until 0900, then 014°T at 8.7 kn until 0915.

   Give the 0915 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 1555 you fix your position 252°T, 2.0 nm from Gannet Rock daybeacon. You steer 305°T at 4.6 kn until 1635, then 091°T at 4.9 kn until 1710.

   Give the 1710 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 1245 you fix your position 074°T, 3.3 nm from Tern Island tower. You steer 182°T at 9.7 kn until 1305, then 007°T at 6.5 kn until 1315.

   Give the 1315 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  

4. At 0825 you fix your position 065°T, 2.1 nm from Heron Point Light. You steer 086°T at 5.2 kn until 0850, then 307°T at 5.1 kn until 0900.

   Give the 0900 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  

5. At 1305 you fix your position 256°T, 3.5 nm from Tern Island tower. You steer 239°T at 4.5 kn until 1320, then 108°T at 8.7 kn until 1335.

   Give the 1335 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  

6. At 0710 you fix your position 091°T, 1.5 nm from Gannet Rock daybeacon. You steer 222°T at 7.8 kn until 0730, then 342°T at 6.1 kn until 0755.

   Give the 0755 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 0905 you fix your position 353°T, 2.9 nm from Mill stack. You steer 350°T at 6.9 kn until 0930, then 307°T at 5.8 kn until 0940.

   Give the 0940 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 1115 you fix your position 334°T, 1.8 nm from Mill stack. You steer 328°T at 9.0 kn until 1145, then 060°T at 5.9 kn until 1215.

   Give the 1215 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