Worksheet 28 · Skill 3

Dead reckoning

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1. At 1215 you fix your position 261°T, 2.7 nm from Gannet Rock daybeacon. You steer 349°T at 8.5 kn until 1235, then 288°T at 6.7 kn until 1320.

   Give the 1320 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  

2. At 1600 you fix your position 257°T, 3.0 nm from Tern Island tower. You steer 172°T at 4.2 kn until 1640, then 068°T at 7.3 kn until 1700.

   Give the 1700 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 1035 you fix your position 046°T, 1.7 nm from Gannet Rock daybeacon. You steer 057°T at 5.6 kn until 1055, then 232°T at 5.6 kn until 1120.

   Give the 1120 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 1100 you fix your position 352°T, 1.0 nm from Heron Point Light. You steer 029°T at 6.4 kn until 1140, then 345°T at 5.3 kn until 1150.

   Give the 1150 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 1325 you fix your position 251°T, 2.3 nm from Tern Island tower. You steer 221°T at 9.0 kn until 1340, then 125°T at 6.2 kn until 1400.

   Give the 1400 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  

6. At 1000 you fix your position 172°T, 1.1 nm from Gannet Rock daybeacon. You steer 059°T at 9.4 kn until 1010, then 252°T at 4.4 kn until 1035.

   Give the 1035 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 1200 you fix your position 241°T, 3.3 nm from Tern Island tower. You steer 180°T at 8.6 kn until 1220, then 301°T at 4.2 kn until 1255.

   Give the 1255 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  

8. At 1220 you fix your position 329°T, 2.3 nm from Mill stack. You steer 063°T at 9.6 kn until 1240, then 271°T at 9.8 kn until 1315.

   Give the 1315 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