Worksheet 697 · Skill 3

Dead reckoning

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1. At 0825 you fix your position 119°T, 1.4 nm from Gannet Rock daybeacon. You steer 235°T at 7.7 kn until 0845, then 035°T at 4.9 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  

2. At 1425 you fix your position 088°T, 2.2 nm from Tern Island tower. You steer 180°T at 5.6 kn until 1445, then 069°T at 5.9 kn until 1505.

   Give the 1505 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 1010 you fix your position 229°T, 3.3 nm from Tern Island tower. You steer 318°T at 4.3 kn until 1025, then 001°T at 7.2 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  

4. At 0905 you fix your position 254°T, 2.3 nm from Tern Island tower. You steer 233°T at 5.9 kn until 0930, then 102°T at 7.5 kn until 0945.

   Give the 0945 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 0935 you fix your position 078°T, 3.5 nm from Tern Island tower. You steer 198°T at 7.7 kn until 0955, then 255°T at 7.6 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  

6. At 1440 you fix your position 284°T, 3.5 nm from Tern Island tower. You steer 126°T at 8.1 kn until 1450, then 253°T at 5.0 kn until 1530.

   Give the 1530 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 0750 you fix your position 061°T, 3.9 nm from Westfield church spire. You steer 193°T at 6.6 kn until 0825, then 334°T at 6.4 kn until 0855.

   Give the 0855 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  

8. At 1330 you fix your position 245°T, 2.9 nm from Tern Island tower. You steer 197°T at 5.1 kn until 1400, then 026°T at 9.5 kn until 1410.

   Give the 1410 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