Worksheet 283 · Skill 3

Dead reckoning

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1. At 1415 you fix your position 036°T, 2.6 nm from Gannet Rock daybeacon. You steer 259°T at 7.9 kn until 1425, then 046°T at 9.4 kn until 1450.

   Give the 1450 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 1305 you fix your position 048°T, 1.9 nm from Heron Point Light. You steer 050°T at 4.9 kn until 1350, then 224°T at 5.7 kn until 1415.

   Give the 1415 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  

3. At 1240 you fix your position 248°T, 2.7 nm from Tern Island tower. You steer 103°T at 9.6 kn until 1315, then 058°T at 5.7 kn until 1335.

   Give the 1335 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 0925 you fix your position 270°T, 2.9 nm from Tern Island tower. You steer 238°T at 5.2 kn until 0935, then 130°T at 7.8 kn until 1010.

   Give the 1010 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 0820 you fix your position 265°T, 1.6 nm from Gannet Rock daybeacon. You steer 105°T at 8.8 kn until 0850, then 312°T at 7.1 kn until 0905.

   Give the 0905 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 1345 you fix your position 051°T, 2.6 nm from Mill stack. You steer 000°T at 8.3 kn until 1410, then 112°T at 8.5 kn until 1435.

   Give the 1435 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 1250 you fix your position 212°T, 2.4 nm from Gannet Rock daybeacon. You steer 332°T at 4.3 kn until 1315, then 245°T at 9.4 kn until 1330.

   Give the 1330 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  

8. At 0915 you fix your position 040°T, 2.8 nm from Gannet Rock daybeacon. You steer 276°T at 4.5 kn until 0935, then 110°T at 9.0 kn until 0955.

   Give the 0955 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