Worksheet 461 · Skill 3

Dead reckoning

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1. At 0825 you fix your position 033°T, 3.5 nm from Heron Point Light. You steer 271°T at 6.0 kn until 0845, then 065°T at 9.5 kn until 0900.

   Give the 0900 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 1205 you fix your position 344°T, 1.5 nm from Heron Point Light. You steer 010°T at 5.6 kn until 1220, then 138°T at 6.7 kn until 1300.

   Give the 1300 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  

3. At 1300 you fix your position 221°T, 2.1 nm from Tern Island tower. You steer 133°T at 5.9 kn until 1315, then 067°T at 7.4 kn until 1400.

   Give the 1400 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 0700 you fix your position 008°T, 1.5 nm from Heron Point Light. You steer 090°T at 9.4 kn until 0720, then 018°T at 9.6 kn until 0735.

   Give the 0735 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 1520 you fix your position 023°T, 1.6 nm from Mill stack. You steer 092°T at 9.0 kn until 1535, then 039°T at 8.5 kn until 1545.

   Give the 1545 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 0710 you fix your position 060°T, 2.1 nm from Gannet Rock daybeacon. You steer 278°T at 5.3 kn until 0720, then 246°T at 4.4 kn until 0750.

   Give the 0750 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  

7. At 1240 you fix your position 092°T, 1.5 nm from Heron Point Light. You steer 063°T at 4.9 kn until 1315, then 320°T at 8.1 kn until 1355.

   Give the 1355 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  

8. At 0835 you fix your position 258°T, 2.2 nm from Gannet Rock daybeacon. You steer 260°T at 4.8 kn until 0910, then 317°T at 5.0 kn until 0930.

   Give the 0930 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