Worksheet 298 · Skill 3

Dead reckoning

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1. At 0845 you fix your position 103°T, 1.9 nm from Tern Island tower. You steer 111°T at 9.8 kn until 0855, then 265°T at 5.2 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  

2. At 1005 you fix your position 030°T, 2.4 nm from Mill stack. You steer 335°T at 5.6 kn until 1045, then 274°T at 6.0 kn until 1130.

   Give the 1130 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  

3. At 0820 you fix your position 269°T, 1.7 nm from Gannet Rock daybeacon. You steer 201°T at 8.0 kn until 0830, then 082°T at 9.0 kn until 0850.

   Give the 0850 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  

4. At 1600 you fix your position 225°T, 2.3 nm from Gannet Rock daybeacon. You steer 322°T at 7.9 kn until 1610, then 062°T at 6.1 kn until 1650.

   Give the 1650 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 0820 you fix your position 289°T, 2.5 nm from Tern Island tower. You steer 241°T at 8.1 kn until 0850, then 177°T at 7.8 kn until 0900.

   Give the 0900 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 1055 you fix your position 304°T, 3.0 nm from Tern Island tower. You steer 281°T at 8.1 kn until 1115, then 165°T at 10.0 kn until 1200.

   Give the 1200 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 1105 you fix your position 025°T, 2.7 nm from Heron Point Light. You steer 313°T at 7.0 kn until 1130, then 171°T at 6.3 kn until 1200.

   Give the 1200 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 0935 you fix your position 039°T, 4.6 nm from Gannet Rock daybeacon. You steer 187°T at 9.4 kn until 0945, then 314°T at 4.9 kn until 1000.

   Give the 1000 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