Worksheet 619 · Skill 3

Dead reckoning

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1. At 0720 you fix your position 026°T, 2.0 nm from Heron Point Light. You steer 109°T at 5.4 kn until 0745, then 005°T at 4.1 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  

2. At 0835 you fix your position 044°T, 2.4 nm from Mill stack. You steer 300°T at 9.9 kn until 0855, then 094°T at 5.5 kn until 0925.

   Give the 0925 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  

3. At 1445 you fix your position 119°T, 1.7 nm from Tern Island tower. You steer 201°T at 4.5 kn until 1525, then 314°T at 5.7 kn until 1605.

   Give the 1605 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 0810 you fix your position 027°T, 3.5 nm from Westfield church spire. You steer 188°T at 8.9 kn until 0840, then 135°T at 9.0 kn until 0855.

   Give the 0855 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 0810 you fix your position 232°T, 2.3 nm from Gannet Rock daybeacon. You steer 046°T at 9.8 kn until 0820, then 312°T at 8.9 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  

6. At 1055 you fix your position 003°T, 2.7 nm from Westfield church spire. You steer 167°T at 4.2 kn until 1115, then 085°T at 7.4 kn until 1140.

   Give the 1140 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 0835 you fix your position 059°T, 3.2 nm from Gannet Rock daybeacon. You steer 153°T at 4.5 kn until 0845, then 237°T at 8.2 kn until 0855.

   Give the 0855 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 1230 you fix your position 054°T, 3.4 nm from Westfield church spire. You steer 130°T at 5.5 kn until 1310, then 227°T at 6.7 kn until 1320.

   Give the 1320 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