Worksheet 708 · Skill 3

Dead reckoning

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1. At 1010 you fix your position 270°T, 1.3 nm from Gannet Rock daybeacon. You steer 262°T at 8.9 kn until 1025, then 232°T at 5.1 kn until 1100.

   Give the 1100 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  

2. At 0900 you fix your position 319°T, 1.7 nm from Tern Island tower. You steer 268°T at 4.1 kn until 0925, then 161°T at 7.0 kn until 0950.

   Give the 0950 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 1520 you fix your position 260°T, 3.5 nm from Tern Island tower. You steer 319°T at 6.3 kn until 1535, then 081°T at 4.2 kn until 1555.

   Give the 1555 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 1535 you fix your position 055°T, 2.5 nm from Tern Island tower. You steer 297°T at 4.2 kn until 1555, then 160°T at 9.3 kn until 1625.

   Give the 1625 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  

5. At 0705 you fix your position 309°T, 3.0 nm from Tern Island tower. You steer 242°T at 8.9 kn until 0725, then 343°T at 8.3 kn until 0735.

   Give the 0735 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 1555 you fix your position 058°T, 1.7 nm from Gannet Rock daybeacon. You steer 343°T at 4.4 kn until 1615, then 140°T at 6.2 kn until 1640.

   Give the 1640 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 1600 you fix your position 271°T, 2.1 nm from Tern Island tower. You steer 256°T at 6.6 kn until 1625, then 036°T at 8.9 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  

8. At 1105 you fix your position 065°T, 2.5 nm from Gannet Rock daybeacon. You steer 217°T at 6.3 kn until 1125, then 073°T at 6.3 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