Worksheet 112 · Skill 3

Dead reckoning

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1. At 1230 you fix your position 027°T, 3.3 nm from Westfield church spire. You steer 111°T at 8.4 kn until 1300, then 053°T at 7.1 kn until 1330.

   Give the 1330 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 0815 you fix your position 253°T, 2.9 nm from Tern Island tower. You steer 121°T at 5.1 kn until 0830, then 326°T at 7.6 kn until 0840.

   Give the 0840 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 1130 you fix your position 295°T, 3.6 nm from Tern Island tower. You steer 201°T at 6.9 kn until 1140, then 330°T at 7.5 kn until 1155.

   Give the 1155 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  

4. At 1500 you fix your position 041°T, 1.5 nm from Gannet Rock daybeacon. You steer 184°T at 4.3 kn until 1520, then 024°T at 8.6 kn until 1540.

   Give the 1540 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  

5. At 1545 you fix your position 033°T, 3.7 nm from Westfield church spire. You steer 321°T at 4.6 kn until 1555, then 165°T at 5.7 kn until 1610.

   Give the 1610 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 1500 you fix your position 053°T, 2.1 nm from Heron Point Light. You steer 244°T at 7.0 kn until 1510, then 332°T at 7.8 kn until 1530.

   Give the 1530 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  

7. At 1100 you fix your position 036°T, 2.5 nm from Gannet Rock daybeacon. You steer 180°T at 5.9 kn until 1110, then 054°T at 6.8 kn until 1120.

   Give the 1120 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 1555 you fix your position 308°T, 1.6 nm from Gannet Rock daybeacon. You steer 209°T at 5.1 kn until 1625, then 343°T at 7.1 kn until 1640.

   Give the 1640 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