Worksheet 449 · Skill 3

Dead reckoning

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1. At 1545 you fix your position 145°T, 2.5 nm from Tern Island tower. You steer 077°T at 6.4 kn until 1605, then 037°T at 10.0 kn until 1615.

   Give the 1615 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 1505 you fix your position 090°T, 2.1 nm from Gannet Rock daybeacon. You steer 015°T at 5.8 kn until 1520, then 334°T at 6.4 kn until 1535.

   Give the 1535 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  

3. At 1055 you fix your position 239°T, 2.0 nm from Tern Island tower. You steer 153°T at 4.2 kn until 1135, then 319°T at 7.8 kn until 1215.

   Give the 1215 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  

4. At 1400 you fix your position 071°T, 1.0 nm from Heron Point Light. You steer 060°T at 6.7 kn until 1415, then 266°T at 5.8 kn until 1440.

   Give the 1440 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  

5. At 1030 you fix your position 058°T, 3.5 nm from Heron Point Light. You steer 276°T at 6.2 kn until 1105, then 019°T at 5.4 kn until 1125.

   Give the 1125 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 1305 you fix your position 013°T, 2.1 nm from Mill stack. You steer 278°T at 4.1 kn until 1340, then 087°T at 7.9 kn until 1425.

   Give the 1425 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 1300 you fix your position 304°T, 3.2 nm from Tern Island tower. You steer 212°T at 7.4 kn until 1330, then 063°T at 4.6 kn until 1350.

   Give the 1350 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 1525 you fix your position 131°T, 2.0 nm from Westfield church spire. You steer 065°T at 6.2 kn until 1545, then 157°T at 8.2 kn until 1610.

   Give the 1610 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