Worksheet 631 · Skill 3

Dead reckoning

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1. At 1055 you fix your position 224°T, 3.4 nm from Tern Island tower. You steer 071°T at 7.0 kn until 1115, then 194°T at 4.1 kn until 1130.

   Give the 1130 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  

2. At 1425 you fix your position 254°T, 2.4 nm from Tern Island tower. You steer 169°T at 7.9 kn until 1440, then 298°T at 6.9 kn until 1525.

   Give the 1525 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 1445 you fix your position 239°T, 2.6 nm from Gannet Rock daybeacon. You steer 271°T at 5.5 kn until 1500, then 220°T at 4.0 kn until 1525.

   Give the 1525 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  

4. At 1055 you fix your position 217°T, 1.9 nm from Gannet Rock daybeacon. You steer 184°T at 6.5 kn until 1105, then 328°T at 9.3 kn until 1140.

   Give the 1140 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 1300 you fix your position 073°T, 1.6 nm from Heron Point Light. You steer 335°T at 6.1 kn until 1340, then 158°T at 6.3 kn until 1400.

   Give the 1400 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  

6. At 1355 you fix your position 354°T, 0.9 nm from Gannet Rock daybeacon. You steer 022°T at 5.3 kn until 1410, then 163°T at 4.5 kn until 1440.

   Give the 1440 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 1545 you fix your position 032°T, 2.5 nm from Westfield church spire. You steer 130°T at 6.7 kn until 1610, then 233°T at 6.5 kn until 1625.

   Give the 1625 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 1025 you fix your position 244°T, 3.0 nm from Tern Island tower. You steer 307°T at 8.8 kn until 1050, then 033°T at 5.9 kn until 1105.

   Give the 1105 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