Worksheet 793 · Skill 3

Dead reckoning

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1. At 0940 you fix your position 270°T, 3.2 nm from Tern Island tower. You steer 047°T at 4.6 kn until 0955, then 356°T at 5.1 kn until 1005.

   Give the 1005 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 0905 you fix your position 060°T, 3.0 nm from Gannet Rock daybeacon. You steer 216°T at 6.6 kn until 0930, then 282°T at 4.2 kn until 0945.

   Give the 0945 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 1520 you fix your position 112°T, 1.7 nm from Gannet Rock daybeacon. You steer 038°T at 7.8 kn until 1530, then 247°T at 6.2 kn until 1605.

   Give the 1605 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 0820 you fix your position 328°T, 1.3 nm from Kittle water tank. You steer 059°T at 8.8 kn until 0830, then 119°T at 4.1 kn until 0840.

   Give the 0840 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 1410 you fix your position 000°T, 2.0 nm from Mill stack. You steer 307°T at 8.6 kn until 1430, then 030°T at 6.5 kn until 1500.

   Give the 1500 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 0745 you fix your position 294°T, 2.0 nm from Tern Island tower. You steer 180°T at 6.1 kn until 0800, then 134°T at 5.6 kn until 0840.

   Give the 0840 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 1555 you fix your position 327°T, 1.9 nm from Mill stack. You steer 308°T at 6.8 kn until 1630, then 358°T at 5.7 kn until 1645.

   Give the 1645 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  

8. At 1555 you fix your position 072°T, 3.6 nm from Westfield church spire. You steer 210°T at 5.7 kn until 1625, then 345°T at 6.1 kn until 1640.

   Give the 1640 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