Worksheet 409 · Skill 3

Dead reckoning

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1. At 1545 you fix your position 052°T, 4.1 nm from Westfield church spire. You steer 108°T at 4.3 kn until 1605, then 049°T at 8.6 kn until 1620.

   Give the 1620 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 0925 you fix your position 273°T, 3.7 nm from Tern Island tower. You steer 069°T at 5.7 kn until 0945, then 172°T at 8.6 kn until 1000.

   Give the 1000 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 1455 you fix your position 091°T, 2.2 nm from Tern Island tower. You steer 167°T at 6.0 kn until 1515, then 344°T at 5.9 kn until 1600.

   Give the 1600 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 1200 you fix your position 245°T, 2.1 nm from Tern Island tower. You steer 239°T at 6.4 kn until 1230, then 091°T at 4.9 kn until 1315.

   Give the 1315 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 0830 you fix your position 049°T, 3.1 nm from Westfield church spire. You steer 145°T at 8.6 kn until 0915, then 035°T at 9.1 kn until 0925.

   Give the 0925 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 1545 you fix your position 323°T, 2.6 nm from Tern Island tower. You steer 155°T at 4.0 kn until 1555, then 186°T at 5.2 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  

7. At 0735 you fix your position 194°T, 2.0 nm from Gannet Rock daybeacon. You steer 316°T at 9.0 kn until 0820, then 036°T at 5.0 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  

8. At 1210 you fix your position 062°T, 2.0 nm from Tern Island tower. You steer 125°T at 7.8 kn until 1240, then 280°T at 7.2 kn until 1255.

   Give the 1255 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