Worksheet 111 · Skill 3

Dead reckoning

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1. At 0730 you fix your position 243°T, 2.5 nm from Tern Island tower. You steer 228°T at 4.4 kn until 0745, then 051°T at 5.5 kn until 0755.

   Give the 0755 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 1510 you fix your position 103°T, 2.1 nm from Gannet Rock daybeacon. You steer 004°T at 7.7 kn until 1530, then 201°T at 9.5 kn until 1555.

   Give the 1555 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

3. At 1000 you fix your position 046°T, 4.0 nm from Gannet Rock daybeacon. You steer 315°T at 8.4 kn until 1010, then 197°T at 5.1 kn until 1020.

   Give the 1020 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 0855 you fix your position 243°T, 2.8 nm from Tern Island tower. You steer 301°T at 7.2 kn until 0905, then 179°T at 7.5 kn until 0930.

   Give the 0930 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  

5. At 0720 you fix your position 224°T, 3.3 nm from Tern Island tower. You steer 074°T at 5.1 kn until 0805, then 007°T at 5.5 kn until 0820.

   Give the 0820 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 1505 you fix your position 038°T, 2.4 nm from Mill stack. You steer 315°T at 7.6 kn until 1535, then 225°T at 4.4 kn until 1610.

   Give the 1610 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  

7. At 1455 you fix your position 211°T, 1.6 nm from Tern Island tower. You steer 156°T at 8.3 kn until 1510, then 262°T at 5.0 kn until 1540.

   Give the 1540 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 1300 you fix your position 110°T, 2.4 nm from Westfield church spire. You steer 116°T at 5.5 kn until 1330, then 048°T at 7.3 kn until 1340.

   Give the 1340 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