Worksheet 548 · Skill 3

Dead reckoning

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1. At 0855 you fix your position 044°T, 2.3 nm from Westfield church spire. You steer 018°T at 4.2 kn until 0920, then 140°T at 8.0 kn until 1005.

   Give the 1005 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 1355 you fix your position 217°T, 3.3 nm from Tern Island tower. You steer 301°T at 8.6 kn until 1405, then 124°T at 5.7 kn until 1425.

   Give the 1425 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 1320 you fix your position 103°T, 2.1 nm from Westfield church spire. You steer 056°T at 9.4 kn until 1350, then 212°T at 7.2 kn until 1415.

   Give the 1415 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  

4. At 1145 you fix your position 265°T, 3.5 nm from Tern Island tower. You steer 210°T at 9.2 kn until 1205, then 151°T at 6.8 kn until 1225.

   Give the 1225 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 1230 you fix your position 269°T, 3.6 nm from Tern Island tower. You steer 153°T at 7.1 kn until 1315, then 325°T at 9.8 kn until 1345.

   Give the 1345 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 1005 you fix your position 011°T, 2.0 nm from Mill stack. You steer 071°T at 7.6 kn until 1020, then 178°T at 4.0 kn until 1045.

   Give the 1045 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  

7. At 0800 you fix your position 035°T, 1.9 nm from Kittle water tank. You steer 219°T at 5.1 kn until 0810, then 289°T at 9.3 kn until 0845.

   Give the 0845 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  

8. At 1105 you fix your position 110°T, 1.3 nm from Westfield church spire. You steer 062°T at 6.4 kn until 1120, then 310°T at 5.2 kn until 1135.

   Give the 1135 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