Worksheet 355 · Skill 3

Dead reckoning

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1. At 1115 you fix your position 031°T, 2.5 nm from Mill stack. You steer 319°T at 6.9 kn until 1140, then 120°T at 7.5 kn until 1220.

   Give the 1220 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  

2. At 0840 you fix your position 211°T, 2.0 nm from Gannet Rock daybeacon. You steer 276°T at 4.1 kn until 0910, then 021°T at 6.0 kn until 0935.

   Give the 0935 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 0735 you fix your position 265°T, 2.6 nm from Tern Island tower. You steer 164°T at 7.7 kn until 0815, then 316°T at 7.0 kn until 0845.

   Give the 0845 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  

4. At 1525 you fix your position 253°T, 1.4 nm from Tern Island tower. You steer 242°T at 6.0 kn until 1555, then 141°T at 4.7 kn until 1615.

   Give the 1615 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 1010 you fix your position 230°T, 2.6 nm from Gannet Rock daybeacon. You steer 342°T at 5.7 kn until 1025, then 065°T at 4.3 kn until 1050.

   Give the 1050 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 0830 you fix your position 081°T, 3.0 nm from Westfield church spire. You steer 004°T at 5.0 kn until 0855, then 081°T at 7.2 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  

7. At 1120 you fix your position 350°T, 1.2 nm from Heron Point Light. You steer 006°T at 7.4 kn until 1150, then 204°T at 9.0 kn until 1210.

   Give the 1210 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  

8. At 0850 you fix your position 318°T, 2.6 nm from Tern Island tower. You steer 107°T at 9.2 kn until 0900, then 267°T at 6.2 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