Worksheet 576 · Skill 3

Dead reckoning

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1. At 1550 you fix your position 225°T, 2.5 nm from Tern Island tower. You steer 326°T at 6.6 kn until 1625, then 120°T at 7.9 kn until 1635.

   Give the 1635 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 1005 you fix your position 309°T, 3.0 nm from Tern Island tower. You steer 107°T at 7.5 kn until 1045, then 220°T at 8.9 kn until 1115.

   Give the 1115 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 0740 you fix your position 021°T, 2.4 nm from Gannet Rock daybeacon. You steer 108°T at 5.3 kn until 0805, then 185°T at 4.1 kn until 0845.

   Give the 0845 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  

4. At 1235 you fix your position 333°T, 1.9 nm from Mill stack. You steer 099°T at 4.3 kn until 1250, then 059°T at 7.1 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  

5. At 1600 you fix your position 203°T, 2.2 nm from Tern Island tower. You steer 278°T at 8.2 kn until 1630, then 105°T at 9.2 kn until 1655.

   Give the 1655 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 1105 you fix your position 039°T, 1.5 nm from Westfield church spire. You steer 039°T at 9.7 kn until 1115, then 084°T at 4.6 kn until 1125.

   Give the 1125 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 1345 you fix your position 295°T, 4.0 nm from Tern Island tower. You steer 251°T at 5.1 kn until 1420, then 146°T at 6.6 kn until 1455.

   Give the 1455 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  

8. At 1215 you fix your position 102°T, 2.2 nm from Gannet Rock daybeacon. You steer 252°T at 9.0 kn until 1240, then 324°T at 5.7 kn until 1255.

   Give the 1255 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