Worksheet 790 · Skill 3

Dead reckoning

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1. At 1240 you fix your position 071°T, 2.5 nm from Gannet Rock daybeacon. You steer 241°T at 7.3 kn until 1310, then 087°T at 4.5 kn until 1335.

   Give the 1335 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 1315 you fix your position 060°T, 3.0 nm from Gannet Rock daybeacon. You steer 230°T at 9.6 kn until 1345, then 281°T at 5.8 kn until 1355.

   Give the 1355 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 1415 you fix your position 072°T, 1.7 nm from Gannet Rock daybeacon. You steer 269°T at 9.2 kn until 1500, then 158°T at 4.3 kn until 1545.

   Give the 1545 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  

4. At 0955 you fix your position 071°T, 1.5 nm from Heron Point Light. You steer 012°T at 4.0 kn until 1035, then 129°T at 8.8 kn until 1110.

   Give the 1110 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 0745 you fix your position 234°T, 2.8 nm from Tern Island tower. You steer 045°T at 6.8 kn until 0755, then 320°T at 7.7 kn until 0825.

   Give the 0825 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 1110 you fix your position 100°T, 3.0 nm from Westfield church spire. You steer 066°T at 9.1 kn until 1120, then 136°T at 5.3 kn until 1200.

   Give the 1200 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 1415 you fix your position 353°T, 2.5 nm from Mill stack. You steer 313°T at 6.0 kn until 1450, then 357°T at 7.0 kn until 1520.

   Give the 1520 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  

8. At 0730 you fix your position 065°T, 3.4 nm from Westfield church spire. You steer 326°T at 6.1 kn until 0755, then 106°T at 5.0 kn until 0830.

   Give the 0830 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