Worksheet 473 · Skill 3

Dead reckoning

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1. At 0815 you fix your position 078°T, 1.9 nm from Heron Point Light. You steer 086°T at 9.3 kn until 0830, then 313°T at 9.4 kn until 0855.

   Give the 0855 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 1230 you fix your position 149°T, 1.2 nm from Westfield church spire. You steer 125°T at 8.6 kn until 1255, then 308°T at 5.0 kn until 1340.

   Give the 1340 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  

3. At 1400 you fix your position 043°T, 4.2 nm from Westfield church spire. You steer 172°T at 9.3 kn until 1420, then 317°T at 9.8 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  

4. At 1520 you fix your position 081°T, 1.5 nm from Tern Island tower. You steer 096°T at 7.4 kn until 1530, then 220°T at 5.2 kn until 1550.

   Give the 1550 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 1105 you fix your position 103°T, 2.7 nm from Westfield church spire. You steer 204°T at 7.9 kn until 1115, then 334°T at 10.0 kn until 1125.

   Give the 1125 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 0700 you fix your position 074°T, 2.9 nm from Tern Island tower. You steer 210°T at 8.9 kn until 0735, then 298°T at 7.3 kn until 0805.

   Give the 0805 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  

7. At 0940 you fix your position 340°T, 2.2 nm from Mill stack. You steer 325°T at 8.4 kn until 1010, then 128°T at 9.7 kn until 1055.

   Give the 1055 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

8. At 1230 you fix your position 031°T, 2.1 nm from Mill stack. You steer 067°T at 8.6 kn until 1305, then 199°T at 9.3 kn until 1315.

   Give the 1315 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm