Worksheet 477 · Skill 3

Dead reckoning

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1. At 1050 you fix your position 043°T, 4.1 nm from Gannet Rock daybeacon. You steer 248°T at 9.9 kn until 1120, then 068°T at 6.3 kn until 1200.

   Give the 1200 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  

2. At 0920 you fix your position 341°T, 2.7 nm from Mill stack. You steer 305°T at 6.7 kn until 0945, then 006°T at 7.6 kn until 1020.

   Give the 1020 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 0855 you fix your position 301°T, 1.0 nm from Gannet Rock daybeacon. You steer 044°T at 5.9 kn until 0920, then 007°T at 8.9 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  

4. At 1550 you fix your position 185°T, 1.6 nm from Tern Island tower. You steer 317°T at 7.7 kn until 1615, then 137°T at 6.7 kn until 1625.

   Give the 1625 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 0735 you fix your position 031°T, 2.3 nm from Gannet Rock daybeacon. You steer 163°T at 5.8 kn until 0805, then 243°T at 8.7 kn until 0815.

   Give the 0815 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  

6. At 0945 you fix your position 020°T, 1.8 nm from Westfield church spire. You steer 125°T at 4.1 kn until 1030, then 223°T at 6.5 kn until 1050.

   Give the 1050 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 1450 you fix your position 089°T, 2.5 nm from Westfield church spire. You steer 148°T at 5.4 kn until 1510, then 299°T at 7.9 kn until 1525.

   Give the 1525 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  

8. At 0930 you fix your position 356°T, 1.4 nm from Heron Point Light. You steer 016°T at 5.3 kn until 1005, then 134°T at 8.2 kn until 1020.

   Give the 1020 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