Worksheet 7 · Skill 3

Dead reckoning

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1. At 1600 you fix your position 141°T, 1.8 nm from Westfield church spire. You steer 032°T at 7.8 kn until 1630, then 321°T at 4.2 kn until 1640.

   Give the 1640 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  

2. At 1250 you fix your position 191°T, 1.7 nm from Tern Island tower. You steer 201°T at 6.4 kn until 1305, then 308°T at 5.3 kn until 1315.

   Give the 1315 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 1100 you fix your position 016°T, 1.6 nm from Mill stack. You steer 033°T at 9.2 kn until 1130, then 110°T at 6.6 kn until 1205.

   Give the 1205 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  

4. At 1420 you fix your position 275°T, 1.8 nm from Tern Island tower. You steer 204°T at 5.3 kn until 1445, then 354°T at 5.2 kn until 1500.

   Give the 1500 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 0830 you fix your position 346°T, 2.9 nm from Mill stack. You steer 131°T at 8.2 kn until 0840, then 040°T at 5.2 kn until 0900.

   Give the 0900 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 0935 you fix your position 065°T, 2.4 nm from Westfield church spire. You steer 102°T at 7.7 kn until 1000, then 250°T at 4.5 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  

7. At 0820 you fix your position 023°T, 2.8 nm from Mill stack. You steer 335°T at 9.9 kn until 0840, then 155°T at 8.9 kn until 0850.

   Give the 0850 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  

8. At 1405 you fix your position 267°T, 2.6 nm from Gannet Rock daybeacon. You steer 334°T at 7.7 kn until 1420, then 106°T at 5.7 kn until 1450.

   Give the 1450 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