Worksheet 725 · Skill 3

Dead reckoning

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1. At 1550 you fix your position 175°T, 1.2 nm from Gannet Rock daybeacon. You steer 229°T at 5.7 kn until 1605, then 275°T at 7.6 kn until 1645.

   Give the 1645 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  

2. At 0900 you fix your position 028°T, 1.6 nm from Gannet Rock daybeacon. You steer 261°T at 7.2 kn until 0930, then 221°T at 8.4 kn until 0945.

   Give the 0945 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  

3. At 1315 you fix your position 022°T, 2.8 nm from Heron Point Light. You steer 135°T at 4.0 kn until 1400, then 007°T at 9.2 kn until 1410.

   Give the 1410 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  

4. At 1025 you fix your position 259°T, 3.6 nm from Tern Island tower. You steer 327°T at 7.0 kn until 1035, then 068°T at 7.6 kn until 1100.

   Give the 1100 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  

5. At 1320 you fix your position 256°T, 1.8 nm from Gannet Rock daybeacon. You steer 272°T at 7.9 kn until 1345, then 148°T at 5.1 kn until 1410.

   Give the 1410 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 1555 you fix your position 001°T, 1.4 nm from Tern Island tower. You steer 085°T at 5.9 kn until 1615, then 276°T at 6.6 kn until 1630.

   Give the 1630 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 0850 you fix your position 004°T, 1.5 nm from Gannet Rock daybeacon. You steer 148°T at 5.4 kn until 0910, then 045°T at 9.0 kn until 0925.

   Give the 0925 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  

8. At 1550 you fix your position 082°T, 1.7 nm from Gannet Rock daybeacon. You steer 117°T at 4.2 kn until 1600, then 245°T at 6.6 kn until 1645.

   Give the 1645 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