Worksheet 668 · Skill 3

Dead reckoning

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1. At 1345 you fix your position 018°T, 2.2 nm from Gannet Rock daybeacon. You steer 170°T at 7.7 kn until 1405, then 234°T at 8.2 kn until 1425.

   Give the 1425 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 1535 you fix your position 020°T, 2.4 nm from Mill stack. You steer 153°T at 4.6 kn until 1555, then 354°T at 5.7 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  

3. At 1205 you fix your position 079°T, 3.5 nm from Tern Island tower. You steer 211°T at 6.2 kn until 1235, then 120°T at 6.2 kn until 1255.

   Give the 1255 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 0900 you fix your position 074°T, 3.6 nm from Westfield church spire. You steer 004°T at 6.7 kn until 0910, then 197°T at 6.8 kn until 0950.

   Give the 0950 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  

5. At 1425 you fix your position 045°T, 2.6 nm from Westfield church spire. You steer 164°T at 6.5 kn until 1440, then 118°T at 7.2 kn until 1450.

   Give the 1450 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 0820 you fix your position 020°T, 2.3 nm from Heron Point Light. You steer 053°T at 5.5 kn until 0905, then 232°T at 5.3 kn until 0920.

   Give the 0920 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 1525 you fix your position 027°T, 2.3 nm from Heron Point Light. You steer 097°T at 6.7 kn until 1600, then 354°T at 9.0 kn until 1610.

   Give the 1610 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 1105 you fix your position 040°T, 2.2 nm from Tern Island tower. You steer 075°T at 7.1 kn until 1115, then 118°T at 6.1 kn until 1140.

   Give the 1140 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