Worksheet 709 · Skill 3

Dead reckoning

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1. At 1540 you fix your position 325°T, 2.8 nm from Kittle water tank. You steer 285°T at 5.9 kn until 1610, then 239°T at 4.2 kn until 1640.

   Give the 1640 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  

2. At 1000 you fix your position 148°T, 2.4 nm from Tern Island tower. You steer 046°T at 7.7 kn until 1010, then 353°T at 4.2 kn until 1020.

   Give the 1020 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 0730 you fix your position 022°T, 1.4 nm from Westfield church spire. You steer 049°T at 6.5 kn until 0750, then 308°T at 4.0 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  

4. At 1225 you fix your position 111°T, 2.0 nm from Westfield church spire. You steer 078°T at 4.1 kn until 1305, then 228°T at 5.1 kn until 1340.

   Give the 1340 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 0735 you fix your position 194°T, 2.0 nm from Gannet Rock daybeacon. You steer 289°T at 5.9 kn until 0820, then 022°T at 6.4 kn until 0855.

   Give the 0855 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  

6. At 0740 you fix your position 284°T, 1.6 nm from Gannet Rock daybeacon. You steer 298°T at 8.3 kn until 0825, then 328°T at 8.6 kn until 0835.

   Give the 0835 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 1545 you fix your position 066°T, 3.0 nm from Westfield church spire. You steer 098°T at 8.8 kn until 1605, then 150°T at 4.7 kn until 1615.

   Give the 1615 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 346°T, 2.1 nm from Mill stack. You steer 092°T at 8.8 kn until 0955, then 323°T at 4.5 kn until 1005.

   Give the 1005 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