Worksheet 266 · Skill 3

Dead reckoning

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1. At 1410 you fix your position 292°T, 1.8 nm from Tern Island tower. You steer 068°T at 5.9 kn until 1425, then 241°T at 8.6 kn until 1500.

   Give the 1500 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 068°T, 3.9 nm from Tern Island tower. You steer 215°T at 7.7 kn until 1615, then 295°T at 7.4 kn until 1655.

   Give the 1655 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  

3. At 0745 you fix your position 224°T, 2.8 nm from Tern Island tower. You steer 082°T at 6.2 kn until 0820, then 205°T at 5.3 kn until 0835.

   Give the 0835 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 1515 you fix your position 156°T, 2.8 nm from Tern Island tower. You steer 308°T at 4.2 kn until 1600, then 122°T at 6.0 kn until 1625.

   Give the 1625 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 1555 you fix your position 025°T, 3.2 nm from Heron Point Light. You steer 319°T at 8.3 kn until 1605, then 002°T at 5.6 kn until 1620.

   Give the 1620 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 1530 you fix your position 057°T, 1.0 nm from Westfield church spire. You steer 059°T at 7.6 kn until 1615, then 222°T at 8.4 kn until 1645.

   Give the 1645 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 0855 you fix your position 306°T, 2.8 nm from Tern Island tower. You steer 094°T at 5.8 kn until 0905, then 280°T at 6.4 kn until 0925.

   Give the 0925 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 0720 you fix your position 054°T, 3.7 nm from Gannet Rock daybeacon. You steer 334°T at 8.4 kn until 0730, then 235°T at 5.0 kn until 0810.

   Give the 0810 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