Worksheet 71 · Skill 3

Dead reckoning

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1. At 0805 you fix your position 279°T, 3.2 nm from Tern Island tower. You steer 048°T at 8.3 kn until 0815, then 293°T at 5.2 kn until 0825.

   Give the 0825 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 1430 you fix your position 278°T, 1.8 nm from Tern Island tower. You steer 275°T at 6.2 kn until 1445, then 150°T at 4.4 kn until 1510.

   Give the 1510 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 0815 you fix your position 170°T, 1.5 nm from Westfield church spire. You steer 064°T at 9.7 kn until 0825, then 009°T at 5.3 kn until 0845.

   Give the 0845 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 0920 you fix your position 061°T, 1.5 nm from Gannet Rock daybeacon. You steer 220°T at 5.0 kn until 0930, then 034°T at 4.5 kn until 1015.

   Give the 1015 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 1030 you fix your position 036°T, 3.1 nm from Gannet Rock daybeacon. You steer 178°T at 6.2 kn until 1105, then 353°T at 8.9 kn until 1115.

   Give the 1115 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 1355 you fix your position 238°T, 3.0 nm from Tern Island tower. You steer 312°T at 8.8 kn until 1405, then 189°T at 6.1 kn until 1415.

   Give the 1415 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 1325 you fix your position 057°T, 3.8 nm from Westfield church spire. You steer 193°T at 8.3 kn until 1350, then 347°T at 8.6 kn until 1415.

   Give the 1415 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 0905 you fix your position 092°T, 3.5 nm from Westfield church spire. You steer 314°T at 8.4 kn until 0930, then 102°T at 6.5 kn until 1015.

   Give the 1015 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