Worksheet 482 · Skill 3

Dead reckoning

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1. At 1025 you fix your position 170°T, 0.8 nm from Gannet Rock daybeacon. You steer 203°T at 6.4 kn until 1040, then 077°T at 7.7 kn until 1105.

   Give the 1105 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  

2. At 1525 you fix your position 050°T, 2.4 nm from Westfield church spire. You steer 125°T at 8.8 kn until 1540, then 229°T at 8.2 kn until 1600.

   Give the 1600 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  

3. At 1425 you fix your position 041°T, 1.8 nm from Tern Island tower. You steer 160°T at 4.0 kn until 1455, then 347°T at 6.9 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  

4. At 1545 you fix your position 035°T, 2.6 nm from Tern Island tower. You steer 244°T at 9.5 kn until 1555, then 279°T at 5.3 kn until 1640.

   Give the 1640 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 1435 you fix your position 103°T, 2.4 nm from Westfield church spire. You steer 113°T at 8.6 kn until 1500, then 329°T at 8.7 kn until 1545.

   Give the 1545 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 1545 you fix your position 059°T, 2.5 nm from Tern Island tower. You steer 155°T at 6.1 kn until 1555, then 224°T at 4.4 kn until 1635.

   Give the 1635 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 1335 you fix your position 251°T, 3.6 nm from Tern Island tower. You steer 038°T at 4.0 kn until 1405, then 354°T at 5.1 kn until 1415.

   Give the 1415 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 1250 you fix your position 243°T, 2.7 nm from Gannet Rock daybeacon. You steer 297°T at 5.8 kn until 1300, then 058°T at 7.8 kn until 1310.

   Give the 1310 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