Worksheet 257 · Skill 3

Dead reckoning

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1. At 1305 you fix your position 049°T, 2.9 nm from Tern Island tower. You steer 273°T at 7.0 kn until 1320, then 113°T at 7.4 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  

2. At 0815 you fix your position 257°T, 1.8 nm from Tern Island tower. You steer 158°T at 5.2 kn until 0900, then 246°T at 5.9 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  

3. At 0820 you fix your position 040°T, 3.2 nm from Westfield church spire. You steer 134°T at 4.3 kn until 0850, then 217°T at 6.1 kn until 0905.

   Give the 0905 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  

4. At 1455 you fix your position 236°T, 2.6 nm from Gannet Rock daybeacon. You steer 103°T at 6.1 kn until 1525, then 323°T at 9.4 kn until 1545.

   Give the 1545 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  

5. At 1105 you fix your position 072°T, 3.4 nm from Westfield church spire. You steer 137°T at 5.8 kn until 1145, then 303°T at 6.8 kn until 1155.

   Give the 1155 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 0755 you fix your position 208°T, 2.0 nm from Tern Island tower. You steer 290°T at 5.0 kn until 0835, then 255°T at 5.1 kn until 0855.

   Give the 0855 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  

7. At 0805 you fix your position 049°T, 1.7 nm from Gannet Rock daybeacon. You steer 348°T at 5.4 kn until 0815, then 126°T at 5.3 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  

8. At 1545 you fix your position 028°T, 3.0 nm from Heron Point Light. You steer 017°T at 7.8 kn until 1615, then 274°T at 4.3 kn until 1635.

   Give the 1635 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