Worksheet 356 · Skill 3

Dead reckoning

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1. At 0910 you fix your position 285°T, 3.1 nm from Tern Island tower. You steer 074°T at 9.7 kn until 0920, then 258°T at 8.8 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 1515 you fix your position 081°T, 2.1 nm from Westfield church spire. You steer 128°T at 5.9 kn until 1545, then 024°T at 6.1 kn until 1620.

   Give the 1620 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 0835 you fix your position 074°T, 3.3 nm from Westfield church spire. You steer 133°T at 8.0 kn until 0900, then 094°T at 4.1 kn until 0945.

   Give the 0945 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 1335 you fix your position 022°T, 2.5 nm from Heron Point Light. You steer 005°T at 4.1 kn until 1345, then 160°T at 5.5 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  

5. At 0705 you fix your position 021°T, 2.9 nm from Heron Point Light. You steer 085°T at 4.3 kn until 0745, then 356°T at 7.5 kn until 0815.

   Give the 0815 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  

6. At 0735 you fix your position 335°T, 2.6 nm from Tern Island tower. You steer 266°T at 6.9 kn until 0805, then 171°T at 7.6 kn until 0845.

   Give the 0845 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  

7. At 1125 you fix your position 040°T, 2.3 nm from Tern Island tower. You steer 269°T at 6.3 kn until 1135, then 147°T at 7.7 kn until 1155.

   Give the 1155 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 0820 you fix your position 005°T, 3.1 nm from Mill stack. You steer 206°T at 6.0 kn until 0830, then 007°T at 6.2 kn until 0915.

   Give the 0915 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