Worksheet 797 · Skill 3

Dead reckoning

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1. At 1505 you fix your position 293°T, 2.6 nm from Tern Island tower. You steer 302°T at 4.0 kn until 1540, then 104°T at 5.6 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  

2. At 1345 you fix your position 046°T, 2.3 nm from Heron Point Light. You steer 351°T at 7.3 kn until 1425, then 107°T at 4.7 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  

3. At 1550 you fix your position 239°T, 2.6 nm from Tern Island tower. You steer 262°T at 6.3 kn until 1615, then 153°T at 8.3 kn until 1635.

   Give the 1635 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  

4. At 1555 you fix your position 080°T, 2.0 nm from Heron Point Light. You steer 056°T at 7.8 kn until 1615, then 234°T at 9.9 kn until 1630.

   Give the 1630 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 1105 you fix your position 217°T, 1.6 nm from Tern Island tower. You steer 125°T at 5.7 kn until 1150, then 231°T at 9.6 kn until 1205.

   Give the 1205 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  

6. At 1320 you fix your position 331°T, 1.4 nm from Gannet Rock daybeacon. You steer 220°T at 8.0 kn until 1335, then 100°T at 4.7 kn until 1350.

   Give the 1350 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 0810 you fix your position 016°T, 1.8 nm from Mill stack. You steer 288°T at 9.3 kn until 0830, then 114°T at 7.9 kn until 0845.

   Give the 0845 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  

8. At 1450 you fix your position 288°T, 4.1 nm from Tern Island tower. You steer 140°T at 9.5 kn until 1500, then 224°T at 6.0 kn until 1510.

   Give the 1510 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