Worksheet 652 · Skill 3

Dead reckoning

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1. At 0930 you fix your position 350°T, 2.9 nm from Mill stack. You steer 023°T at 4.7 kn until 0955, then 283°T at 6.0 kn until 1015.

   Give the 1015 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 1425 you fix your position 024°T, 3.8 nm from Westfield church spire. You steer 128°T at 9.4 kn until 1510, then 314°T at 6.2 kn until 1550.

   Give the 1550 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 0800 you fix your position 064°T, 2.0 nm from Gannet Rock daybeacon. You steer 275°T at 9.2 kn until 0835, then 016°T at 5.1 kn until 0915.

   Give the 0915 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 045°T, 1.7 nm from Heron Point Light. You steer 012°T at 6.2 kn until 0715, then 295°T at 4.8 kn until 0800.

   Give the 0800 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  

5. At 1505 you fix your position 358°T, 3.3 nm from Mill stack. You steer 283°T at 8.1 kn until 1515, then 325°T at 5.2 kn until 1550.

   Give the 1550 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 1340 you fix your position 059°T, 1.4 nm from Gannet Rock daybeacon. You steer 340°T at 4.2 kn until 1420, then 130°T at 8.1 kn until 1445.

   Give the 1445 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 0740 you fix your position 015°T, 3.1 nm from Westfield church spire. You steer 183°T at 6.4 kn until 0755, then 089°T at 8.7 kn until 0830.

   Give the 0830 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 0935 you fix your position 082°T, 2.0 nm from Westfield church spire. You steer 033°T at 5.6 kn until 1005, then 105°T at 5.2 kn until 1025.

   Give the 1025 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