Worksheet 556 · Skill 3

Dead reckoning

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1. At 0750 you fix your position 088°T, 1.3 nm from Westfield church spire. You steer 079°T at 8.1 kn until 0805, then 310°T at 10.0 kn until 0825.

   Give the 0825 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 0820 you fix your position 269°T, 2.8 nm from Tern Island tower. You steer 141°T at 9.5 kn until 0855, then 336°T at 6.4 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  

3. At 1110 you fix your position 243°T, 3.5 nm from Tern Island tower. You steer 016°T at 6.2 kn until 1130, then 062°T at 4.7 kn until 1200.

   Give the 1200 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 0700 you fix your position 208°T, 2.5 nm from Gannet Rock daybeacon. You steer 355°T at 8.5 kn until 0720, then 227°T at 6.9 kn until 0750.

   Give the 0750 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

5. At 0910 you fix your position 353°T, 2.5 nm from Mill stack. You steer 114°T at 4.5 kn until 0935, then 055°T at 4.4 kn until 1005.

   Give the 1005 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 1150 you fix your position 060°T, 3.7 nm from Westfield church spire. You steer 234°T at 5.4 kn until 1200, then 141°T at 8.6 kn until 1230.

   Give the 1230 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

7. At 0915 you fix your position 234°T, 2.7 nm from Tern Island tower. You steer 000°T at 9.3 kn until 0925, then 212°T at 4.6 kn until 1010.

   Give the 1010 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 1240 you fix your position 065°T, 2.3 nm from Tern Island tower. You steer 159°T at 6.4 kn until 1325, then 339°T at 8.9 kn until 1335.

   Give the 1335 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