Worksheet 407 · Skill 3

Dead reckoning

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1. At 0755 you fix your position 131°T, 1.7 nm from Westfield church spire. You steer 116°T at 6.7 kn until 0825, then 037°T at 7.5 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  

2. At 1350 you fix your position 341°T, 2.7 nm from Mill stack. You steer 032°T at 5.4 kn until 1405, then 141°T at 6.3 kn until 1435.

   Give the 1435 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  

3. At 1530 you fix your position 029°T, 1.6 nm from Tern Island tower. You steer 149°T at 6.6 kn until 1555, then 230°T at 8.4 kn until 1625.

   Give the 1625 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 1420 you fix your position 185°T, 1.6 nm from Gannet Rock daybeacon. You steer 267°T at 6.6 kn until 1430, then 103°T at 5.4 kn until 1500.

   Give the 1500 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 1600 you fix your position 190°T, 1.4 nm from Tern Island tower. You steer 208°T at 8.2 kn until 1615, then 300°T at 6.9 kn until 1640.

   Give the 1640 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 1000 you fix your position 273°T, 3.6 nm from Tern Island tower. You steer 127°T at 7.1 kn until 1015, then 324°T at 4.8 kn until 1030.

   Give the 1030 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  

7. At 1435 you fix your position 007°T, 1.6 nm from Westfield church spire. You steer 130°T at 9.8 kn until 1520, then 023°T at 7.7 kn until 1545.

   Give the 1545 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 1020 you fix your position 036°T, 4.4 nm from Westfield church spire. You steer 160°T at 8.8 kn until 1100, then 096°T at 4.4 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