Worksheet 662 · Skill 3

Dead reckoning

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1. At 1535 you fix your position 084°T, 2.8 nm from Tern Island tower. You steer 211°T at 5.5 kn until 1600, then 100°T at 8.4 kn until 1615.

   Give the 1615 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  

2. At 0955 you fix your position 266°T, 3.4 nm from Tern Island tower. You steer 151°T at 5.3 kn until 1035, then 205°T at 4.0 kn until 1105.

   Give the 1105 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 1555 you fix your position 039°T, 1.4 nm from Gannet Rock daybeacon. You steer 007°T at 8.1 kn until 1605, then 085°T at 5.8 kn until 1620.

   Give the 1620 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 1105 you fix your position 266°T, 1.9 nm from Tern Island tower. You steer 241°T at 9.3 kn until 1135, then 345°T at 5.5 kn until 1205.

   Give the 1205 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  

5. At 1015 you fix your position 261°T, 1.7 nm from Gannet Rock daybeacon. You steer 280°T at 7.7 kn until 1025, then 196°T at 4.3 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  

6. At 0730 you fix your position 024°T, 3.0 nm from Heron Point Light. You steer 019°T at 4.5 kn until 0745, then 167°T at 8.8 kn until 0800.

   Give the 0800 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 1035 you fix your position 209°T, 3.0 nm from Tern Island tower. You steer 001°T at 6.7 kn until 1045, then 175°T at 4.9 kn until 1105.

   Give the 1105 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 1430 you fix your position 034°T, 1.0 nm from Gannet Rock daybeacon. You steer 015°T at 4.5 kn until 1450, then 224°T at 9.7 kn until 1500.

   Give the 1500 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