Worksheet 150 · Skill 3

Dead reckoning

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1. At 0935 you fix your position 051°T, 1.5 nm from Westfield church spire. You steer 196°T at 4.5 kn until 0945, then 109°T at 5.3 kn until 1010.

   Give the 1010 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  

2. At 1245 you fix your position 030°T, 1.8 nm from Mill stack. You steer 300°T at 6.7 kn until 1315, then 177°T at 9.6 kn until 1325.

   Give the 1325 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  

3. At 1535 you fix your position 323°T, 3.0 nm from Kittle water tank. You steer 245°T at 6.8 kn until 1555, then 286°T at 5.6 kn until 1605.

   Give the 1605 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 0830 you fix your position 006°T, 1.7 nm from Gannet Rock daybeacon. You steer 223°T at 7.1 kn until 0905, then 123°T at 7.3 kn until 0915.

   Give the 0915 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 1010 you fix your position 335°T, 2.2 nm from Mill stack. You steer 326°T at 7.9 kn until 1050, then 103°T at 4.7 kn until 1110.

   Give the 1110 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  

6. At 1200 you fix your position 132°T, 1.3 nm from Gannet Rock daybeacon. You steer 353°T at 7.5 kn until 1225, then 035°T at 4.9 kn until 1300.

   Give the 1300 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  

7. At 1215 you fix your position 141°T, 1.1 nm from Gannet Rock daybeacon. You steer 241°T at 10.0 kn until 1225, then 299°T at 9.1 kn until 1310.

   Give the 1310 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  

8. At 0935 you fix your position 262°T, 2.7 nm from Gannet Rock daybeacon. You steer 241°T at 5.1 kn until 1010, then 348°T at 4.1 kn until 1050.

   Give the 1050 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