Worksheet 426 · Skill 3

Dead reckoning

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1. At 1335 you fix your position 287°T, 3.5 nm from Tern Island tower. You steer 287°T at 5.4 kn until 1355, then 108°T at 6.0 kn until 1435.

   Give the 1435 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 1555 you fix your position 024°T, 2.6 nm from Westfield church spire. You steer 084°T at 8.5 kn until 1620, then 121°T at 4.0 kn until 1640.

   Give the 1640 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 1540 you fix your position 044°T, 1.9 nm from Heron Point Light. You steer 069°T at 6.8 kn until 1610, then 308°T at 5.3 kn until 1645.

   Give the 1645 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 0910 you fix your position 280°T, 3.5 nm from Tern Island tower. You steer 285°T at 4.9 kn until 0930, then 101°T at 7.5 kn until 0950.

   Give the 0950 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 0715 you fix your position 099°T, 3.0 nm from Westfield church spire. You steer 146°T at 5.3 kn until 0730, then 325°T at 6.9 kn until 0815.

   Give the 0815 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 0900 you fix your position 021°T, 1.9 nm from Tern Island tower. You steer 155°T at 7.3 kn until 0925, then 247°T at 4.0 kn until 0940.

   Give the 0940 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 1040 you fix your position 107°T, 2.2 nm from Gannet Rock daybeacon. You steer 017°T at 6.0 kn until 1100, then 237°T at 8.2 kn until 1110.

   Give the 1110 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  

8. At 0710 you fix your position 306°T, 4.2 nm from Tern Island tower. You steer 139°T at 8.8 kn until 0730, then 273°T at 5.8 kn until 0755.

   Give the 0755 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