Worksheet 705 · Skill 3

Dead reckoning

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1. At 0805 you fix your position 304°T, 1.3 nm from Gannet Rock daybeacon. You steer 066°T at 5.5 kn until 0840, then 012°T at 4.9 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  

2. At 0800 you fix your position 089°T, 3.5 nm from Westfield church spire. You steer 000°T at 9.2 kn until 0820, then 236°T at 9.6 kn until 0845.

   Give the 0845 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  

3. At 1525 you fix your position 031°T, 1.0 nm from Gannet Rock daybeacon. You steer 032°T at 8.4 kn until 1535, then 258°T at 6.2 kn until 1615.

   Give the 1615 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 0840 you fix your position 279°T, 1.7 nm from Tern Island tower. You steer 159°T at 7.2 kn until 0900, then 211°T at 6.3 kn until 0915.

   Give the 0915 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  

5. At 1125 you fix your position 020°T, 2.0 nm from Tern Island tower. You steer 060°T at 8.1 kn until 1135, then 265°T at 9.0 kn until 1205.

   Give the 1205 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 1540 you fix your position 057°T, 2.9 nm from Heron Point Light. You steer 117°T at 9.9 kn until 1605, then 032°T at 4.1 kn until 1625.

   Give the 1625 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 1025 you fix your position 287°T, 3.6 nm from Tern Island tower. You steer 194°T at 7.7 kn until 1040, then 159°T at 9.7 kn until 1100.

   Give the 1100 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 1145 you fix your position 039°T, 2.3 nm from Gannet Rock daybeacon. You steer 200°T at 9.1 kn until 1215, then 294°T at 5.5 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