Worksheet 642 · Skill 3

Dead reckoning

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1. At 1305 you fix your position 332°T, 2.1 nm from Mill stack. You steer 076°T at 9.7 kn until 1320, then 344°T at 9.4 kn until 1400.

   Give the 1400 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 0800 you fix your position 039°T, 2.4 nm from Westfield church spire. You steer 129°T at 7.7 kn until 0845, then 332°T at 7.9 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  

3. At 0825 you fix your position 233°T, 3.2 nm from Tern Island tower. You steer 029°T at 8.4 kn until 0835, then 176°T at 5.2 kn until 0905.

   Give the 0905 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  

4. At 1335 you fix your position 094°T, 2.8 nm from Gannet Rock daybeacon. You steer 261°T at 7.9 kn until 1400, then 226°T at 4.3 kn until 1425.

   Give the 1425 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 1140 you fix your position 187°T, 2.0 nm from Tern Island tower. You steer 281°T at 4.3 kn until 1215, then 192°T at 5.0 kn until 1235.

   Give the 1235 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 1245 you fix your position 276°T, 2.2 nm from Tern Island tower. You steer 184°T at 5.6 kn until 1325, then 069°T at 6.5 kn until 1345.

   Give the 1345 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 1105 you fix your position 249°T, 2.9 nm from Tern Island tower. You steer 245°T at 6.2 kn until 1130, then 083°T at 7.1 kn until 1205.

   Give the 1205 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 1040 you fix your position 092°T, 2.9 nm from Gannet Rock daybeacon. You steer 190°T at 5.6 kn until 1105, then 326°T at 9.9 kn until 1130.

   Give the 1130 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