Worksheet 424 · Skill 3

Dead reckoning

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1. At 1100 you fix your position 067°T, 3.0 nm from Westfield church spire. You steer 242°T at 4.4 kn until 1115, then 319°T at 5.0 kn until 1135.

   Give the 1135 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 0825 you fix your position 068°T, 2.4 nm from Tern Island tower. You steer 336°T at 5.5 kn until 0835, then 261°T at 6.1 kn until 0855.

   Give the 0855 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 1030 you fix your position 277°T, 2.2 nm from Tern Island tower. You steer 229°T at 7.7 kn until 1040, then 124°T at 10.0 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  

4. At 1115 you fix your position 354°T, 3.1 nm from Mill stack. You steer 271°T at 5.0 kn until 1140, then 077°T at 4.9 kn until 1225.

   Give the 1225 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 1125 you fix your position 021°T, 2.3 nm from Gannet Rock daybeacon. You steer 125°T at 4.4 kn until 1155, then 241°T at 7.4 kn until 1220.

   Give the 1220 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  

6. At 1125 you fix your position 065°T, 2.8 nm from Westfield church spire. You steer 118°T at 4.1 kn until 1145, then 159°T at 6.1 kn until 1155.

   Give the 1155 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 1450 you fix your position 297°T, 0.9 nm from Gannet Rock daybeacon. You steer 233°T at 6.8 kn until 1505, then 308°T at 7.5 kn until 1535.

   Give the 1535 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 0815 you fix your position 043°T, 4.0 nm from Westfield church spire. You steer 168°T at 5.7 kn until 0830, then 131°T at 7.6 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