Worksheet 327 · Skill 3

Dead reckoning

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1. At 1350 you fix your position 014°T, 2.5 nm from Westfield church spire. You steer 072°T at 5.6 kn until 1420, then 251°T at 4.1 kn until 1445.

   Give the 1445 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 1250 you fix your position 001°T, 2.1 nm from Tern Island tower. You steer 220°T at 5.8 kn until 1330, then 061°T at 6.5 kn until 1340.

   Give the 1340 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 0750 you fix your position 228°T, 1.9 nm from Tern Island tower. You steer 259°T at 6.5 kn until 0830, then 057°T at 7.5 kn until 0840.

   Give the 0840 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  

4. At 0915 you fix your position 059°T, 2.2 nm from Westfield church spire. You steer 033°T at 5.5 kn until 0940, then 197°T at 4.9 kn until 1025.

   Give the 1025 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  

5. At 0735 you fix your position 043°T, 2.3 nm from Westfield church spire. You steer 151°T at 5.7 kn until 0820, then 097°T at 5.3 kn until 0855.

   Give the 0855 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  

6. At 1330 you fix your position 115°T, 1.7 nm from Westfield church spire. You steer 158°T at 7.4 kn until 1345, then 121°T at 9.5 kn until 1405.

   Give the 1405 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  

7. At 1120 you fix your position 080°T, 2.5 nm from Westfield church spire. You steer 314°T at 5.3 kn until 1130, then 188°T at 8.0 kn until 1150.

   Give the 1150 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 1535 you fix your position 206°T, 2.2 nm from Tern Island tower. You steer 255°T at 8.5 kn until 1605, then 080°T at 5.4 kn until 1635.

   Give the 1635 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