Worksheet 146 · Skill 3

Dead reckoning

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1. At 0820 you fix your position 083°T, 3.1 nm from Tern Island tower. You steer 261°T at 9.8 kn until 0830, then 114°T at 5.0 kn until 0915.

   Give the 0915 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  

2. At 1525 you fix your position 103°T, 2.8 nm from Westfield church spire. You steer 266°T at 4.4 kn until 1550, then 108°T at 7.6 kn until 1615.

   Give the 1615 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  

3. At 1350 you fix your position 004°T, 2.2 nm from Heron Point Light. You steer 067°T at 8.0 kn until 1415, then 211°T at 9.8 kn until 1425.

   Give the 1425 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  

4. At 1430 you fix your position 019°T, 2.4 nm from Westfield church spire. You steer 349°T at 6.2 kn until 1440, then 133°T at 7.1 kn until 1500.

   Give the 1500 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 1110 you fix your position 199°T, 2.2 nm from Tern Island tower. You steer 335°T at 5.7 kn until 1120, then 303°T at 7.7 kn until 1150.

   Give the 1150 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 1050 you fix your position 047°T, 3.2 nm from Westfield church spire. You steer 293°T at 4.4 kn until 1105, then 066°T at 4.1 kn until 1135.

   Give the 1135 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  

7. At 0900 you fix your position 303°T, 2.8 nm from Tern Island tower. You steer 174°T at 4.9 kn until 0940, then 064°T at 7.3 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  

8. At 1140 you fix your position 358°T, 1.0 nm from Kittle water tank. You steer 019°T at 7.2 kn until 1215, then 301°T at 8.2 kn until 1235.

   Give the 1235 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