Worksheet 775 · Skill 3

Dead reckoning

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1. At 0720 you fix your position 319°T, 1.5 nm from Gannet Rock daybeacon. You steer 074°T at 6.6 kn until 0800, then 270°T at 7.2 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  

2. At 1510 you fix your position 031°T, 2.3 nm from Gannet Rock daybeacon. You steer 109°T at 4.2 kn until 1525, then 180°T at 8.5 kn until 1550.

   Give the 1550 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  

3. At 1425 you fix your position 010°T, 1.8 nm from Kittle water tank. You steer 345°T at 4.5 kn until 1450, then 121°T at 9.2 kn until 1500.

   Give the 1500 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 1015 you fix your position 065°T, 3.4 nm from Tern Island tower. You steer 256°T at 6.6 kn until 1030, then 108°T at 8.9 kn until 1040.

   Give the 1040 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 0955 you fix your position 061°T, 2.4 nm from Gannet Rock daybeacon. You steer 349°T at 7.7 kn until 1020, then 225°T at 4.1 kn until 1050.

   Give the 1050 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 0740 you fix your position 114°T, 2.0 nm from Gannet Rock daybeacon. You steer 173°T at 4.8 kn until 0755, then 281°T at 5.8 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  

7. At 0755 you fix your position 037°T, 1.0 nm from Westfield church spire. You steer 066°T at 7.2 kn until 0840, then 172°T at 4.7 kn until 0910.

   Give the 0910 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 119°T, 1.3 nm from Gannet Rock daybeacon. You steer 260°T at 5.5 kn until 1125, then 186°T at 7.1 kn until 1135.

   Give the 1135 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