Worksheet 89 · Skill 3

Dead reckoning

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1. At 1150 you fix your position 025°T, 3.3 nm from Heron Point Light. You steer 123°T at 4.6 kn until 1230, then 311°T at 7.0 kn until 1240.

   Give the 1240 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  

2. At 1345 you fix your position 266°T, 3.4 nm from Tern Island tower. You steer 228°T at 5.6 kn until 1420, then 085°T at 6.7 kn until 1445.

   Give the 1445 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 1515 you fix your position 311°T, 1.4 nm from Tern Island tower. You steer 216°T at 4.9 kn until 1555, then 296°T at 8.5 kn until 1630.

   Give the 1630 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  

4. At 1535 you fix your position 244°T, 2.0 nm from Tern Island tower. You steer 128°T at 7.1 kn until 1605, then 219°T at 6.0 kn until 1620.

   Give the 1620 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 0815 you fix your position 052°T, 1.4 nm from Tern Island tower. You steer 281°T at 6.4 kn until 0845, then 106°T at 6.1 kn until 0900.

   Give the 0900 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  

6. At 0815 you fix your position 014°T, 3.4 nm from Westfield church spire. You steer 138°T at 5.2 kn until 0840, then 344°T at 5.6 kn until 0855.

   Give the 0855 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  

7. At 1500 you fix your position 214°T, 3.3 nm from Tern Island tower. You steer 145°T at 4.2 kn until 1520, then 091°T at 10.0 kn until 1530.

   Give the 1530 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 0835 you fix your position 251°T, 2.7 nm from Gannet Rock daybeacon. You steer 279°T at 6.5 kn until 0855, then 220°T at 7.8 kn until 0905.

   Give the 0905 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