Worksheet 583 · Skill 3

Dead reckoning

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1. At 1535 you fix your position 298°T, 3.5 nm from Tern Island tower. You steer 184°T at 4.6 kn until 1620, then 081°T at 5.3 kn until 1630.

   Give the 1630 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 0755 you fix your position 352°T, 3.3 nm from Mill stack. You steer 284°T at 6.0 kn until 0835, then 003°T at 8.6 kn until 0905.

   Give the 0905 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  

3. At 1025 you fix your position 352°T, 1.2 nm from Heron Point Light. You steer 357°T at 7.9 kn until 1100, then 142°T at 5.9 kn until 1140.

   Give the 1140 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  

4. At 1450 you fix your position 038°T, 2.8 nm from Gannet Rock daybeacon. You steer 346°T at 5.1 kn until 1520, then 246°T at 5.6 kn until 1530.

   Give the 1530 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 1445 you fix your position 089°T, 1.0 nm from Gannet Rock daybeacon. You steer 222°T at 7.6 kn until 1505, then 070°T at 4.7 kn until 1525.

   Give the 1525 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  

6. At 0910 you fix your position 061°T, 2.6 nm from Westfield church spire. You steer 193°T at 6.7 kn until 0920, then 330°T at 4.2 kn until 0940.

   Give the 0940 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 1030 you fix your position 051°T, 2.7 nm from Westfield church spire. You steer 296°T at 7.1 kn until 1040, then 130°T at 8.0 kn until 1100.

   Give the 1100 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 1440 you fix your position 127°T, 1.7 nm from Gannet Rock daybeacon. You steer 223°T at 4.8 kn until 1500, then 302°T at 4.3 kn until 1515.

   Give the 1515 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