Worksheet 279 · Skill 3

Dead reckoning

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1. At 0845 you fix your position 012°T, 1.0 nm from Heron Point Light. You steer 047°T at 8.9 kn until 0910, then 342°T at 8.6 kn until 0930.

   Give the 0930 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 1525 you fix your position 212°T, 2.1 nm from Tern Island tower. You steer 350°T at 5.8 kn until 1600, then 173°T at 7.6 kn until 1640.

   Give the 1640 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 0900 you fix your position 101°T, 2.5 nm from Westfield church spire. You steer 173°T at 6.6 kn until 0910, then 319°T at 5.7 kn until 0935.

   Give the 0935 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  

4. At 1130 you fix your position 100°T, 2.0 nm from Gannet Rock daybeacon. You steer 111°T at 7.4 kn until 1140, then 354°T at 5.8 kn until 1225.

   Give the 1225 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 1000 you fix your position 246°T, 2.0 nm from Gannet Rock daybeacon. You steer 289°T at 5.9 kn until 1045, then 142°T at 7.4 kn until 1120.

   Give the 1120 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 1505 you fix your position 242°T, 2.0 nm from Gannet Rock daybeacon. You steer 016°T at 6.5 kn until 1525, then 074°T at 8.3 kn until 1555.

   Give the 1555 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 0930 you fix your position 086°T, 3.5 nm from Westfield church spire. You steer 132°T at 8.3 kn until 1010, then 005°T at 4.8 kn until 1025.

   Give the 1025 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 1210 you fix your position 002°T, 1.4 nm from Heron Point Light. You steer 014°T at 6.2 kn until 1220, then 058°T at 4.8 kn until 1300.

   Give the 1300 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