Worksheet 560 · Skill 3

Dead reckoning

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1. At 0945 you fix your position 072°T, 1.9 nm from Tern Island tower. You steer 295°T at 5.8 kn until 1010, then 116°T at 9.1 kn until 1050.

   Give the 1050 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 1500 you fix your position 296°T, 3.6 nm from Tern Island tower. You steer 061°T at 4.2 kn until 1530, then 122°T at 4.8 kn until 1540.

   Give the 1540 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 1025 you fix your position 169°T, 1.0 nm from Gannet Rock daybeacon. You steer 306°T at 7.7 kn until 1110, then 226°T at 5.9 kn until 1140.

   Give the 1140 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  

4. At 1135 you fix your position 044°T, 2.9 nm from Heron Point Light. You steer 322°T at 8.2 kn until 1205, then 357°T at 7.0 kn until 1220.

   Give the 1220 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  

5. At 1505 you fix your position 085°T, 3.3 nm from Westfield church spire. You steer 194°T at 7.2 kn until 1520, then 331°T at 6.3 kn until 1605.

   Give the 1605 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 0740 you fix your position 208°T, 3.2 nm from Tern Island tower. You steer 218°T at 4.2 kn until 0755, then 248°T at 5.2 kn until 0815.

   Give the 0815 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 0840 you fix your position 100°T, 2.2 nm from Gannet Rock daybeacon. You steer 328°T at 9.5 kn until 0905, then 173°T at 4.6 kn until 0920.

   Give the 0920 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 1055 you fix your position 051°T, 3.6 nm from Westfield church spire. You steer 124°T at 8.9 kn until 1110, then 282°T at 6.6 kn until 1125.

   Give the 1125 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