Worksheet 743 · Skill 3

Dead reckoning

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1. At 1035 you fix your position 044°T, 2.4 nm from Westfield church spire. You steer 043°T at 6.9 kn until 1055, then 168°T at 6.5 kn until 1125.

   Give the 1125 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 1410 you fix your position 021°T, 2.9 nm from Heron Point Light. You steer 356°T at 6.8 kn until 1445, then 129°T at 8.3 kn until 1525.

   Give the 1525 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 1220 you fix your position 046°T, 3.0 nm from Gannet Rock daybeacon. You steer 182°T at 7.7 kn until 1240, then 260°T at 5.1 kn until 1320.

   Give the 1320 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 1535 you fix your position 062°T, 3.0 nm from Gannet Rock daybeacon. You steer 335°T at 8.1 kn until 1600, then 214°T at 9.6 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 1120 you fix your position 233°T, 1.3 nm from Tern Island tower. You steer 286°T at 4.4 kn until 1140, then 157°T at 6.7 kn until 1155.

   Give the 1155 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  

6. At 1210 you fix your position 130°T, 1.1 nm from Gannet Rock daybeacon. You steer 048°T at 4.6 kn until 1230, then 281°T at 5.7 kn until 1300.

   Give the 1300 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 0810 you fix your position 035°T, 2.7 nm from Westfield church spire. You steer 187°T at 9.2 kn until 0820, then 334°T at 5.1 kn until 0845.

   Give the 0845 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 0915 you fix your position 068°T, 3.5 nm from Westfield church spire. You steer 069°T at 8.9 kn until 0950, then 102°T at 9.7 kn until 1010.

   Give the 1010 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