Worksheet 718 · Skill 3

Dead reckoning

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1. At 0855 you fix your position 029°T, 0.9 nm from Gannet Rock daybeacon. You steer 167°T at 4.6 kn until 0935, then 322°T at 4.9 kn until 0945.

   Give the 0945 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 1520 you fix your position 292°T, 2.0 nm from Tern Island tower. You steer 218°T at 8.8 kn until 1550, then 359°T at 6.1 kn until 1605.

   Give the 1605 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 1440 you fix your position 310°T, 1.4 nm from Tern Island tower. You steer 048°T at 5.3 kn until 1455, then 272°T at 9.5 kn until 1535.

   Give the 1535 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 1010 you fix your position 043°T, 3.6 nm from Gannet Rock daybeacon. You steer 327°T at 6.8 kn until 1025, then 173°T at 8.8 kn until 1055.

   Give the 1055 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 1125 you fix your position 047°T, 2.3 nm from Westfield church spire. You steer 048°T at 9.0 kn until 1140, then 150°T at 5.9 kn until 1200.

   Give the 1200 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 1115 you fix your position 216°T, 1.5 nm from Gannet Rock daybeacon. You steer 156°T at 8.5 kn until 1125, then 337°T at 4.9 kn until 1205.

   Give the 1205 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 0710 you fix your position 089°T, 3.1 nm from Westfield church spire. You steer 023°T at 7.1 kn until 0735, then 162°T at 10.0 kn until 0815.

   Give the 0815 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 0845 you fix your position 348°T, 2.8 nm from Mill stack. You steer 300°T at 4.6 kn until 0915, then 062°T at 4.9 kn until 0945.

   Give the 0945 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