Worksheet 622 · Skill 3

Dead reckoning

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1. At 0835 you fix your position 040°T, 2.5 nm from Mill stack. You steer 312°T at 4.1 kn until 0855, then 282°T at 8.4 kn until 0940.

   Give the 0940 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 0920 you fix your position 209°T, 2.6 nm from Tern Island tower. You steer 071°T at 8.6 kn until 0950, then 038°T at 5.4 kn until 1025.

   Give the 1025 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 1340 you fix your position 032°T, 2.3 nm from Westfield church spire. You steer 073°T at 4.9 kn until 1355, then 270°T at 5.4 kn until 1405.

   Give the 1405 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 1025 you fix your position 281°T, 1.9 nm from Tern Island tower. You steer 309°T at 8.6 kn until 1040, then 085°T at 8.6 kn until 1050.

   Give the 1050 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 1015 you fix your position 038°T, 4.8 nm from Gannet Rock daybeacon. You steer 194°T at 6.3 kn until 1100, then 242°T at 7.4 kn until 1120.

   Give the 1120 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 0900 you fix your position 324°T, 2.2 nm from Mill stack. You steer 173°T at 4.7 kn until 0910, then 026°T at 9.2 kn until 0930.

   Give the 0930 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 1325 you fix your position 294°T, 3.7 nm from Tern Island tower. You steer 222°T at 7.2 kn until 1400, then 133°T at 4.8 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  

8. At 0805 you fix your position 149°T, 2.4 nm from Tern Island tower. You steer 062°T at 7.1 kn until 0820, then 310°T at 4.1 kn until 0830.

   Give the 0830 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