Worksheet 373 · Skill 3

Dead reckoning

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1. At 1455 you fix your position 265°T, 2.2 nm from Tern Island tower. You steer 133°T at 4.7 kn until 1520, then 251°T at 6.8 kn until 1550.

   Give the 1550 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 1050 you fix your position 316°T, 1.3 nm from Gannet Rock daybeacon. You steer 298°T at 4.3 kn until 1105, then 123°T at 4.4 kn until 1130.

   Give the 1130 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 1445 you fix your position 201°T, 2.0 nm from Tern Island tower. You steer 289°T at 6.9 kn until 1510, then 195°T at 8.2 kn until 1525.

   Give the 1525 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 1015 you fix your position 014°T, 2.0 nm from Westfield church spire. You steer 144°T at 8.7 kn until 1025, then 006°T at 4.9 kn until 1100.

   Give the 1100 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 0905 you fix your position 055°T, 3.6 nm from Gannet Rock daybeacon. You steer 209°T at 7.3 kn until 0920, then 300°T at 7.0 kn until 0940.

   Give the 0940 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 1025 you fix your position 056°T, 2.6 nm from Westfield church spire. You steer 119°T at 6.0 kn until 1050, then 150°T at 5.1 kn until 1115.

   Give the 1115 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 1230 you fix your position 172°T, 1.4 nm from Westfield church spire. You steer 096°T at 5.9 kn until 1300, then 348°T at 4.5 kn until 1340.

   Give the 1340 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 0910 you fix your position 225°T, 2.0 nm from Gannet Rock daybeacon. You steer 350°T at 4.2 kn until 0950, then 196°T at 8.8 kn until 1020.

   Give the 1020 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