Worksheet 674 · Skill 3

Dead reckoning

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1. At 1210 you fix your position 009°T, 1.1 nm from Heron Point Light. You steer 082°T at 8.1 kn until 1225, then 120°T at 5.8 kn until 1305.

   Give the 1305 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  

2. At 1125 you fix your position 192°T, 0.8 nm from Gannet Rock daybeacon. You steer 302°T at 9.8 kn until 1135, then 184°T at 4.2 kn until 1200.

   Give the 1200 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 0740 you fix your position 285°T, 2.4 nm from Tern Island tower. You steer 200°T at 5.5 kn until 0815, then 006°T at 8.6 kn until 0840.

   Give the 0840 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  

4. At 1105 you fix your position 059°T, 2.7 nm from Westfield church spire. You steer 051°T at 5.3 kn until 1125, then 131°T at 9.7 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  

5. At 1500 you fix your position 071°T, 1.4 nm from Westfield church spire. You steer 047°T at 6.0 kn until 1525, then 144°T at 8.8 kn until 1550.

   Give the 1550 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 1430 you fix your position 060°T, 1.3 nm from Westfield church spire. You steer 354°T at 5.4 kn until 1445, then 104°T at 4.4 kn until 1515.

   Give the 1515 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 1035 you fix your position 082°T, 2.3 nm from Heron Point Light. You steer 097°T at 4.4 kn until 1050, then 325°T at 7.6 kn until 1110.

   Give the 1110 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 1045 you fix your position 359°T, 2.0 nm from Heron Point Light. You steer 050°T at 8.0 kn until 1105, then 125°T at 7.3 kn until 1115.

   Give the 1115 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