Worksheet 123 · Skill 3

Dead reckoning

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1. At 1445 you fix your position 221°T, 2.5 nm from Tern Island tower. You steer 211°T at 6.1 kn until 1505, then 133°T at 5.1 kn until 1520.

   Give the 1520 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

2. At 1205 you fix your position 206°T, 2.5 nm from Tern Island tower. You steer 040°T at 8.9 kn until 1215, then 167°T at 4.5 kn until 1245.

   Give the 1245 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 1450 you fix your position 122°T, 1.0 nm from Gannet Rock daybeacon. You steer 024°T at 6.6 kn until 1525, then 175°T at 7.3 kn until 1605.

   Give the 1605 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  

4. At 1150 you fix your position 008°T, 3.2 nm from Westfield church spire. You steer 122°T at 6.0 kn until 1230, then 296°T at 9.2 kn until 1245.

   Give the 1245 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  

5. At 1515 you fix your position 265°T, 3.4 nm from Tern Island tower. You steer 210°T at 8.1 kn until 1540, then 100°T at 4.9 kn until 1605.

   Give the 1605 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  

6. At 0710 you fix your position 029°T, 1.7 nm from Gannet Rock daybeacon. You steer 035°T at 5.2 kn until 0755, then 192°T at 8.7 kn until 0830.

   Give the 0830 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 1425 you fix your position 268°T, 2.0 nm from Gannet Rock daybeacon. You steer 109°T at 8.3 kn until 1445, then 271°T at 7.9 kn until 1530.

   Give the 1530 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  

8. At 1000 you fix your position 029°T, 2.4 nm from Heron Point Light. You steer 107°T at 4.6 kn until 1030, then 269°T at 9.6 kn until 1055.

   Give the 1055 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