Worksheet 144 · Skill 3

Dead reckoning

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1. At 0840 you fix your position 019°T, 3.0 nm from Westfield church spire. You steer 138°T at 5.4 kn until 0920, then 358°T at 5.9 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  

2. At 1050 you fix your position 236°T, 1.7 nm from Tern Island tower. You steer 224°T at 6.5 kn until 1120, then 076°T at 4.3 kn until 1135.

   Give the 1135 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 1440 you fix your position 231°T, 3.1 nm from Tern Island tower. You steer 347°T at 8.7 kn until 1455, then 305°T at 4.3 kn until 1515.

   Give the 1515 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 1150 you fix your position 038°T, 3.0 nm from Westfield church spire. You steer 144°T at 8.0 kn until 1235, then 279°T at 5.0 kn until 1250.

   Give the 1250 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  

5. At 1000 you fix your position 021°T, 1.0 nm from Kittle water tank. You steer 345°T at 6.2 kn until 1025, then 114°T at 6.7 kn until 1045.

   Give the 1045 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  

6. At 1220 you fix your position 284°T, 3.3 nm from Tern Island tower. You steer 206°T at 8.5 kn until 1240, then 002°T at 5.1 kn until 1315.

   Give the 1315 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 1120 you fix your position 254°T, 3.3 nm from Tern Island tower. You steer 151°T at 8.3 kn until 1135, then 083°T at 5.2 kn until 1155.

   Give the 1155 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 1505 you fix your position 098°T, 3.0 nm from Westfield church spire. You steer 118°T at 9.8 kn until 1525, then 162°T at 6.8 kn until 1545.

   Give the 1545 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