Worksheet 533 · Skill 3

Dead reckoning

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1. At 0920 you fix your position 354°T, 2.0 nm from Tern Island tower. You steer 114°T at 4.6 kn until 0945, then 177°T at 6.6 kn until 1010.

   Give the 1010 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  

2. At 1535 you fix your position 053°T, 4.1 nm from Westfield church spire. You steer 195°T at 7.7 kn until 1545, then 126°T at 10.0 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  

3. At 0825 you fix your position 233°T, 2.8 nm from Tern Island tower. You steer 021°T at 4.1 kn until 0850, then 253°T at 5.2 kn until 0915.

   Give the 0915 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 0845 you fix your position 228°T, 2.9 nm from Tern Island tower. You steer 286°T at 4.5 kn until 0855, then 142°T at 9.8 kn until 0920.

   Give the 0920 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 1300 you fix your position 153°T, 1.7 nm from Westfield church spire. You steer 073°T at 7.5 kn until 1330, then 273°T at 10.0 kn until 1350.

   Give the 1350 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 0705 you fix your position 236°T, 2.3 nm from Tern Island tower. You steer 225°T at 4.0 kn until 0740, then 338°T at 6.7 kn until 0820.

   Give the 0820 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 0845 you fix your position 132°T, 1.4 nm from Tern Island tower. You steer 082°T at 7.1 kn until 0905, then 290°T at 6.9 kn until 0920.

   Give the 0920 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 0805 you fix your position 033°T, 2.6 nm from Kittle water tank. You steer 001°T at 6.1 kn until 0825, then 267°T at 4.5 kn until 0910.

   Give the 0910 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