Worksheet 259 · Skill 3

Dead reckoning

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1. At 1120 you fix your position 222°T, 2.7 nm from Tern Island tower. You steer 271°T at 9.5 kn until 1145, then 069°T at 4.2 kn until 1200.

   Give the 1200 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 0950 you fix your position 002°T, 3.0 nm from Mill stack. You steer 004°T at 5.3 kn until 1025, then 217°T at 7.5 kn until 1035.

   Give the 1035 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 0810 you fix your position 022°T, 1.2 nm from Heron Point Light. You steer 334°T at 7.2 kn until 0835, then 069°T at 6.0 kn until 0905.

   Give the 0905 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 0725 you fix your position 092°T, 2.0 nm from Tern Island tower. You steer 190°T at 5.1 kn until 0745, then 271°T at 6.0 kn until 0830.

   Give the 0830 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  

5. At 0900 you fix your position 085°T, 2.5 nm from Westfield church spire. You steer 297°T at 6.6 kn until 0915, then 103°T at 4.3 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  

6. At 0845 you fix your position 298°T, 4.2 nm from Tern Island tower. You steer 165°T at 7.9 kn until 0900, then 063°T at 6.6 kn until 0930.

   Give the 0930 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 0830 you fix your position 073°T, 2.4 nm from Westfield church spire. You steer 066°T at 7.1 kn until 0905, then 295°T at 5.7 kn until 0925.

   Give the 0925 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 0825 you fix your position 316°T, 3.3 nm from Tern Island tower. You steer 254°T at 7.0 kn until 0905, then 079°T at 6.4 kn until 0915.

   Give the 0915 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