Worksheet 605 · Skill 3

Dead reckoning

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1. At 1415 you fix your position 208°T, 2.7 nm from Tern Island tower. You steer 316°T at 7.5 kn until 1455, then 215°T at 8.8 kn until 1515.

   Give the 1515 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 1530 you fix your position 014°T, 1.6 nm from Gannet Rock daybeacon. You steer 218°T at 9.0 kn until 1550, then 042°T at 7.1 kn until 1615.

   Give the 1615 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  

3. At 1535 you fix your position 057°T, 1.1 nm from Westfield church spire. You steer 141°T at 6.3 kn until 1605, then 039°T at 6.0 kn until 1650.

   Give the 1650 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  

4. At 1005 you fix your position 011°T, 1.8 nm from Tern Island tower. You steer 228°T at 4.9 kn until 1050, then 313°T at 7.0 kn until 1115.

   Give the 1115 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 0840 you fix your position 108°T, 1.6 nm from Gannet Rock daybeacon. You steer 039°T at 6.1 kn until 0900, then 310°T at 4.0 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  

6. At 1140 you fix your position 265°T, 3.1 nm from Tern Island tower. You steer 000°T at 5.1 kn until 1150, then 169°T at 5.2 kn until 1215.

   Give the 1215 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 1340 you fix your position 281°T, 2.9 nm from Tern Island tower. You steer 202°T at 6.6 kn until 1350, then 296°T at 6.5 kn until 1400.

   Give the 1400 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 0715 you fix your position 246°T, 3.3 nm from Tern Island tower. You steer 288°T at 4.3 kn until 0735, then 096°T at 9.4 kn until 0750.

   Give the 0750 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