Worksheet 269 · Skill 3

Dead reckoning

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1. At 0835 you fix your position 019°T, 1.3 nm from Westfield church spire. You steer 102°T at 5.0 kn until 0900, then 200°T at 4.2 kn until 0935.

   Give the 0935 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  

2. At 0930 you fix your position 063°T, 3.2 nm from Heron Point Light. You steer 070°T at 4.5 kn until 1015, then 284°T at 9.7 kn until 1045.

   Give the 1045 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  

3. At 1520 you fix your position 226°T, 1.6 nm from Tern Island tower. You steer 234°T at 9.8 kn until 1535, then 101°T at 9.7 kn until 1605.

   Give the 1605 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  

4. At 1120 you fix your position 084°T, 2.5 nm from Westfield church spire. You steer 065°T at 7.8 kn until 1155, then 213°T at 4.2 kn until 1205.

   Give the 1205 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 0830 you fix your position 231°T, 2.7 nm from Tern Island tower. You steer 093°T at 4.2 kn until 0855, then 232°T at 9.6 kn until 0915.

   Give the 0915 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  

6. At 1140 you fix your position 022°T, 1.7 nm from Tern Island tower. You steer 329°T at 6.3 kn until 1150, then 206°T at 7.2 kn until 1200.

   Give the 1200 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 265°T, 3.4 nm from Tern Island tower. You steer 239°T at 6.9 kn until 0845, then 066°T at 7.2 kn until 0855.

   Give the 0855 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 0745 you fix your position 050°T, 1.9 nm from Tern Island tower. You steer 111°T at 8.0 kn until 0755, then 312°T at 4.5 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