Worksheet 78 · Skill 3

Dead reckoning

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1. At 1040 you fix your position 125°T, 2.1 nm from Westfield church spire. You steer 359°T at 7.8 kn until 1105, then 099°T at 5.1 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  

2. At 1300 you fix your position 060°T, 2.7 nm from Tern Island tower. You steer 274°T at 6.2 kn until 1340, then 213°T at 6.2 kn until 1420.

   Give the 1420 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  

3. At 0720 you fix your position 225°T, 3.2 nm from Tern Island tower. You steer 113°T at 7.1 kn until 0750, then 293°T at 8.2 kn until 0800.

   Give the 0800 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 1105 you fix your position 066°T, 2.8 nm from Gannet Rock daybeacon. You steer 196°T at 6.6 kn until 1115, then 001°T at 9.9 kn until 1135.

   Give the 1135 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  

5. At 1250 you fix your position 293°T, 1.8 nm from Tern Island tower. You steer 182°T at 7.2 kn until 1325, then 064°T at 6.2 kn until 1335.

   Give the 1335 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 1255 you fix your position 112°T, 1.5 nm from Westfield church spire. You steer 154°T at 9.8 kn until 1310, then 340°T at 8.9 kn until 1320.

   Give the 1320 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  

7. At 0855 you fix your position 245°T, 1.0 nm from Gannet Rock daybeacon. You steer 298°T at 8.7 kn until 0910, then 110°T at 5.0 kn until 0930.

   Give the 0930 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 0830 you fix your position 255°T, 2.9 nm from Tern Island tower. You steer 206°T at 6.6 kn until 0905, then 315°T at 5.5 kn until 0935.

   Give the 0935 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