Worksheet 367 · Skill 3

Dead reckoning

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1. At 0730 you fix your position 047°T, 2.5 nm from Mill stack. You steer 332°T at 7.6 kn until 0750, then 123°T at 9.7 kn until 0810.

   Give the 0810 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 1530 you fix your position 061°T, 2.2 nm from Heron Point Light. You steer 091°T at 8.3 kn until 1555, then 036°T at 8.7 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  

3. At 1500 you fix your position 178°T, 0.9 nm from Gannet Rock daybeacon. You steer 264°T at 4.3 kn until 1545, then 213°T at 6.0 kn until 1555.

   Give the 1555 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  

4. At 1005 you fix your position 097°T, 2.8 nm from Gannet Rock daybeacon. You steer 258°T at 4.9 kn until 1035, then 117°T at 6.4 kn until 1105.

   Give the 1105 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  

5. At 0725 you fix your position 000°T, 1.2 nm from Gannet Rock daybeacon. You steer 021°T at 6.1 kn until 0800, then 206°T at 6.9 kn until 0835.

   Give the 0835 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 1130 you fix your position 339°T, 1.1 nm from Kittle water tank. You steer 031°T at 4.4 kn until 1150, then 231°T at 4.8 kn until 1225.

   Give the 1225 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  

7. At 0945 you fix your position 359°T, 3.0 nm from Mill stack. You steer 332°T at 4.9 kn until 0955, then 239°T at 5.7 kn until 1010.

   Give the 1010 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  

8. At 0845 you fix your position 324°T, 2.3 nm from Tern Island tower. You steer 199°T at 8.7 kn until 0925, then 331°T at 9.1 kn until 0945.

   Give the 0945 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