Worksheet 564 · Skill 3

Dead reckoning

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1. At 1255 you fix your position 250°T, 2.7 nm from Tern Island tower. You steer 125°T at 5.3 kn until 1310, then 300°T at 6.7 kn until 1350.

   Give the 1350 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 1535 you fix your position 141°T, 1.9 nm from Westfield church spire. You steer 109°T at 6.2 kn until 1615, then 017°T at 4.5 kn until 1640.

   Give the 1640 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  

3. At 1530 you fix your position 050°T, 2.7 nm from Heron Point Light. You steer 035°T at 7.0 kn until 1545, then 277°T at 9.6 kn until 1555.

   Give the 1555 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 0830 you fix your position 016°T, 0.9 nm from Heron Point Light. You steer 063°T at 5.3 kn until 0855, then 264°T at 4.1 kn until 0905.

   Give the 0905 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 1255 you fix your position 138°T, 1.1 nm from Westfield church spire. You steer 024°T at 6.7 kn until 1315, then 253°T at 4.9 kn until 1325.

   Give the 1325 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 0855 you fix your position 035°T, 1.5 nm from Heron Point Light. You steer 048°T at 4.7 kn until 0935, then 278°T at 7.6 kn until 1000.

   Give the 1000 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 1215 you fix your position 286°T, 3.0 nm from Tern Island tower. You steer 262°T at 9.9 kn until 1235, then 042°T at 4.0 kn until 1300.

   Give the 1300 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 1115 you fix your position 055°T, 2.4 nm from Tern Island tower. You steer 165°T at 8.8 kn until 1155, then 339°T at 5.3 kn until 1225.

   Give the 1225 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