Worksheet 614 · Skill 3

Dead reckoning

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1. At 0915 you fix your position 229°T, 3.4 nm from Tern Island tower. You steer 260°T at 5.3 kn until 0950, then 040°T at 9.9 kn until 1000.

   Give the 1000 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 1350 you fix your position 266°T, 2.2 nm from Gannet Rock daybeacon. You steer 248°T at 4.7 kn until 1425, then 022°T at 5.0 kn until 1440.

   Give the 1440 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 1550 you fix your position 264°T, 2.5 nm from Gannet Rock daybeacon. You steer 208°T at 6.7 kn until 1610, then 023°T at 8.6 kn until 1635.

   Give the 1635 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 1355 you fix your position 350°T, 2.6 nm from Mill stack. You steer 132°T at 4.7 kn until 1425, then 288°T at 4.2 kn until 1505.

   Give the 1505 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  

5. At 1535 you fix your position 327°T, 1.0 nm from Gannet Rock daybeacon. You steer 268°T at 4.8 kn until 1605, then 224°T at 4.2 kn until 1635.

   Give the 1635 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  

6. At 0705 you fix your position 026°T, 3.2 nm from Heron Point Light. You steer 251°T at 4.1 kn until 0715, then 187°T at 6.3 kn until 0725.

   Give the 0725 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  

7. At 1000 you fix your position 349°T, 2.6 nm from Mill stack. You steer 145°T at 5.6 kn until 1010, then 354°T at 8.4 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  

8. At 1510 you fix your position 023°T, 2.3 nm from Kittle water tank. You steer 305°T at 8.9 kn until 1530, then 229°T at 5.2 kn until 1550.

   Give the 1550 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