Worksheet 127 · Skill 3

Dead reckoning

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1. At 1310 you fix your position 041°T, 4.4 nm from Westfield church spire. You steer 147°T at 6.0 kn until 1325, then 254°T at 8.1 kn until 1345.

   Give the 1345 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 1600 you fix your position 064°T, 4.9 nm from Tern Island tower. You steer 232°T at 9.7 kn until 1610, then 180°T at 5.0 kn until 1645.

   Give the 1645 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 1200 you fix your position 299°T, 3.9 nm from Tern Island tower. You steer 179°T at 4.0 kn until 1225, then 004°T at 6.7 kn until 1245.

   Give the 1245 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 0935 you fix your position 158°T, 1.5 nm from Tern Island tower. You steer 251°T at 6.8 kn until 0945, then 318°T at 6.0 kn until 1005.

   Give the 1005 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 1120 you fix your position 283°T, 3.6 nm from Tern Island tower. You steer 312°T at 6.1 kn until 1130, then 127°T at 8.2 kn until 1200.

   Give the 1200 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 0810 you fix your position 285°T, 3.9 nm from Tern Island tower. You steer 148°T at 9.5 kn until 0820, then 079°T at 9.4 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  

7. At 1555 you fix your position 270°T, 3.1 nm from Tern Island tower. You steer 214°T at 5.8 kn until 1630, then 142°T at 7.2 kn until 1650.

   Give the 1650 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 0700 you fix your position 141°T, 1.5 nm from Tern Island tower. You steer 184°T at 6.7 kn until 0715, then 106°T at 4.1 kn until 0735.

   Give the 0735 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm