Worksheet 232 · Skill 3

Dead reckoning

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1. At 1100 you fix your position 221°T, 2.3 nm from Tern Island tower. You steer 171°T at 8.1 kn until 1110, then 289°T at 7.9 kn until 1140.

   Give the 1140 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 0915 you fix your position 095°T, 1.0 nm from Gannet Rock daybeacon. You steer 308°T at 5.0 kn until 0930, then 262°T at 9.4 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  

3. At 0750 you fix your position 059°T, 1.7 nm from Tern Island tower. You steer 136°T at 6.4 kn until 0825, then 280°T at 9.5 kn until 0840.

   Give the 0840 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 0825 you fix your position 336°T, 1.7 nm from Mill stack. You steer 297°T at 10.0 kn until 0845, then 098°T at 7.6 kn until 0925.

   Give the 0925 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 0935 you fix your position 282°T, 3.4 nm from Tern Island tower. You steer 117°T at 8.6 kn until 0945, then 199°T at 5.3 kn until 1025.

   Give the 1025 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 1505 you fix your position 095°T, 1.5 nm from Gannet Rock daybeacon. You steer 322°T at 7.9 kn until 1525, then 044°T at 4.6 kn until 1610.

   Give the 1610 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 1510 you fix your position 310°T, 2.3 nm from Tern Island tower. You steer 212°T at 6.7 kn until 1550, then 132°T at 5.3 kn until 1605.

   Give the 1605 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 1145 you fix your position 074°T, 1.6 nm from Tern Island tower. You steer 058°T at 4.6 kn until 1215, then 287°T at 8.2 kn until 1230.

   Give the 1230 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