Worksheet 358 · Skill 3

Dead reckoning

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1. At 0915 you fix your position 205°T, 1.4 nm from Tern Island tower. You steer 238°T at 6.2 kn until 0930, then 176°T at 5.8 kn until 0940.

   Give the 0940 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  

2. At 1545 you fix your position 089°T, 2.8 nm from Westfield church spire. You steer 039°T at 4.5 kn until 1615, then 137°T at 7.5 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  

3. At 1600 you fix your position 055°T, 1.5 nm from Heron Point Light. You steer 013°T at 6.9 kn until 1645, then 080°T at 9.4 kn until 1710.

   Give the 1710 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 1600 you fix your position 235°T, 2.5 nm from Gannet Rock daybeacon. You steer 084°T at 8.6 kn until 1615, then 019°T at 5.4 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  

5. At 0745 you fix your position 055°T, 3.5 nm from Heron Point Light. You steer 084°T at 6.6 kn until 0805, then 279°T at 7.8 kn until 0850.

   Give the 0850 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 0720 you fix your position 156°T, 2.9 nm from Tern Island tower. You steer 265°T at 5.7 kn until 0800, then 337°T at 9.3 kn until 0830.

   Give the 0830 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 1300 you fix your position 334°T, 1.4 nm from Tern Island tower. You steer 222°T at 7.2 kn until 1335, then 021°T at 6.7 kn until 1405.

   Give the 1405 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 1550 you fix your position 075°T, 1.7 nm from Tern Island tower. You steer 050°T at 5.1 kn until 1615, then 180°T at 7.6 kn until 1655.

   Give the 1655 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