Worksheet 637 · Skill 3

Dead reckoning

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1. At 0705 you fix your position 223°T, 3.5 nm from Tern Island tower. You steer 073°T at 5.7 kn until 0750, then 125°T at 6.6 kn until 0810.

   Give the 0810 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 1505 you fix your position 081°T, 3.5 nm from Westfield church spire. You steer 005°T at 4.5 kn until 1525, then 267°T at 5.9 kn until 1540.

   Give the 1540 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  

3. At 1005 you fix your position 043°T, 2.6 nm from Gannet Rock daybeacon. You steer 196°T at 6.5 kn until 1015, then 024°T at 8.3 kn until 1030.

   Give the 1030 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 0925 you fix your position 165°T, 1.5 nm from Tern Island tower. You steer 191°T at 8.6 kn until 0935, then 058°T at 8.8 kn until 0955.

   Give the 0955 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 1330 you fix your position 035°T, 4.0 nm from Westfield church spire. You steer 269°T at 5.0 kn until 1350, then 162°T at 7.0 kn until 1405.

   Give the 1405 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 1055 you fix your position 342°T, 1.5 nm from Heron Point Light. You steer 290°T at 9.6 kn until 1105, then 049°T at 6.9 kn until 1150.

   Give the 1150 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 1230 you fix your position 217°T, 3.1 nm from Tern Island tower. You steer 182°T at 6.6 kn until 1250, then 059°T at 6.8 kn until 1315.

   Give the 1315 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 1205 you fix your position 043°T, 3.8 nm from Gannet Rock daybeacon. You steer 254°T at 4.6 kn until 1245, then 022°T at 4.0 kn until 1325.

   Give the 1325 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