Worksheet 604 · Skill 3

Dead reckoning

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1. At 0705 you fix your position 330°T, 1.4 nm from Gannet Rock daybeacon. You steer 202°T at 5.4 kn until 0715, then 045°T at 9.1 kn until 0730.

   Give the 0730 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 1145 you fix your position 244°T, 2.2 nm from Gannet Rock daybeacon. You steer 298°T at 8.8 kn until 1210, then 048°T at 5.3 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  

3. At 1350 you fix your position 226°T, 1.1 nm from Gannet Rock daybeacon. You steer 013°T at 7.3 kn until 1425, then 099°T at 6.1 kn until 1440.

   Give the 1440 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  

4. At 1515 you fix your position 284°T, 3.4 nm from Tern Island tower. You steer 194°T at 8.4 kn until 1545, then 019°T at 7.1 kn until 1620.

   Give the 1620 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  

5. At 0840 you fix your position 085°T, 3.4 nm from Westfield church spire. You steer 198°T at 7.5 kn until 0850, then 348°T at 6.6 kn until 0920.

   Give the 0920 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 1515 you fix your position 053°T, 3.7 nm from Westfield church spire. You steer 355°T at 7.6 kn until 1525, then 245°T at 7.5 kn until 1550.

   Give the 1550 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 0715 you fix your position 231°T, 2.9 nm from Tern Island tower. You steer 271°T at 4.3 kn until 0745, then 090°T at 9.1 kn until 0820.

   Give the 0820 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 1050 you fix your position 034°T, 1.7 nm from Gannet Rock daybeacon. You steer 031°T at 6.2 kn until 1105, then 341°T at 7.0 kn until 1125.

   Give the 1125 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