Worksheet 651 · Skill 3

Dead reckoning

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1. At 0945 you fix your position 040°T, 2.2 nm from Gannet Rock daybeacon. You steer 091°T at 6.4 kn until 0955, then 014°T at 6.0 kn until 1015.

   Give the 1015 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  

2. At 1205 you fix your position 028°T, 3.3 nm from Westfield church spire. You steer 115°T at 4.0 kn until 1245, then 338°T at 6.7 kn until 1255.

   Give the 1255 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 0900 you fix your position 033°T, 3.6 nm from Gannet Rock daybeacon. You steer 170°T at 5.3 kn until 0935, then 340°T at 8.0 kn until 1000.

   Give the 1000 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 1020 you fix your position 297°T, 2.3 nm from Tern Island tower. You steer 240°T at 9.5 kn until 1035, then 056°T at 6.3 kn until 1055.

   Give the 1055 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 1505 you fix your position 274°T, 1.7 nm from Tern Island tower. You steer 151°T at 4.9 kn until 1545, then 031°T at 4.4 kn until 1605.

   Give the 1605 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 1555 you fix your position 263°T, 2.8 nm from Tern Island tower. You steer 130°T at 5.3 kn until 1630, then 306°T at 8.0 kn until 1645.

   Give the 1645 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 0750 you fix your position 003°T, 1.5 nm from Tern Island tower. You steer 114°T at 6.5 kn until 0820, then 216°T at 4.8 kn until 0905.

   Give the 0905 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  

8. At 1520 you fix your position 040°T, 3.3 nm from Heron Point Light. You steer 091°T at 8.2 kn until 1530, then 320°T at 9.1 kn until 1600.

   Give the 1600 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