Worksheet 566 · Skill 3

Dead reckoning

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1. At 1200 you fix your position 018°T, 2.1 nm from Mill stack. You steer 210°T at 5.1 kn until 1210, then 034°T at 7.3 kn until 1240.

   Give the 1240 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 1040 you fix your position 003°T, 2.0 nm from Heron Point Light. You steer 049°T at 6.8 kn until 1110, then 013°T at 4.9 kn until 1145.

   Give the 1145 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 0930 you fix your position 236°T, 2.2 nm from Tern Island tower. You steer 229°T at 8.6 kn until 0955, then 005°T at 6.0 kn until 1025.

   Give the 1025 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 0710 you fix your position 244°T, 3.6 nm from Tern Island tower. You steer 244°T at 8.5 kn until 0730, then 055°T at 7.1 kn until 0745.

   Give the 0745 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 0715 you fix your position 269°T, 3.6 nm from Tern Island tower. You steer 049°T at 9.2 kn until 0730, then 186°T at 5.1 kn until 0810.

   Give the 0810 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 1235 you fix your position 030°T, 2.5 nm from Tern Island tower. You steer 128°T at 7.6 kn until 1310, then 306°T at 4.9 kn until 1345.

   Give the 1345 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 0805 you fix your position 295°T, 1.9 nm from Tern Island tower. You steer 066°T at 7.8 kn until 0825, then 155°T at 5.8 kn until 0840.

   Give the 0840 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 0845 you fix your position 091°T, 2.3 nm from Westfield church spire. You steer 343°T at 6.7 kn until 0920, then 182°T at 8.4 kn until 0945.

   Give the 0945 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