Worksheet 69 · Skill 3

Dead reckoning

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1. At 1015 you fix your position 000°T, 2.5 nm from Tern Island tower. You steer 091°T at 8.0 kn until 1045, then 163°T at 6.5 kn until 1110.

   Give the 1110 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 0815 you fix your position 293°T, 2.4 nm from Tern Island tower. You steer 310°T at 4.3 kn until 0840, then 148°T at 5.6 kn until 0905.

   Give the 0905 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 0745 you fix your position 324°T, 2.0 nm from Mill stack. You steer 078°T at 8.4 kn until 0800, then 330°T at 4.1 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  

4. At 1340 you fix your position 007°T, 2.9 nm from Mill stack. You steer 105°T at 5.1 kn until 1425, then 069°T at 8.9 kn until 1440.

   Give the 1440 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  

5. At 1110 you fix your position 273°T, 3.3 nm from Tern Island tower. You steer 276°T at 6.6 kn until 1140, then 172°T at 5.8 kn until 1210.

   Give the 1210 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  

6. At 1200 you fix your position 038°T, 4.5 nm from Gannet Rock daybeacon. You steer 185°T at 10.0 kn until 1230, then 341°T at 6.0 kn until 1255.

   Give the 1255 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  

7. At 1020 you fix your position 226°T, 2.1 nm from Tern Island tower. You steer 290°T at 5.1 kn until 1105, then 026°T at 5.7 kn until 1115.

   Give the 1115 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 0805 you fix your position 066°T, 2.6 nm from Gannet Rock daybeacon. You steer 011°T at 5.6 kn until 0840, then 220°T at 4.4 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