Worksheet 169 · Skill 3

Dead reckoning

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1. At 0730 you fix your position 044°T, 3.0 nm from Westfield church spire. You steer 132°T at 5.2 kn until 0805, then 303°T at 5.9 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  

2. At 1105 you fix your position 082°T, 2.7 nm from Tern Island tower. You steer 228°T at 8.5 kn until 1140, then 056°T at 5.8 kn until 1210.

   Give the 1210 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 0830 you fix your position 348°T, 2.1 nm from Mill stack. You steer 339°T at 8.9 kn until 0850, then 026°T at 8.6 kn until 0915.

   Give the 0915 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 0740 you fix your position 021°T, 1.9 nm from Mill stack. You steer 288°T at 4.8 kn until 0750, then 096°T at 6.5 kn until 0805.

   Give the 0805 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  

5. At 0935 you fix your position 020°T, 1.3 nm from Gannet Rock daybeacon. You steer 331°T at 4.9 kn until 1000, then 132°T at 7.6 kn until 1025.

   Give the 1025 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 1410 you fix your position 303°T, 4.5 nm from Tern Island tower. You steer 132°T at 5.2 kn until 1450, then 208°T at 4.9 kn until 1535.

   Give the 1535 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 1250 you fix your position 004°T, 2.2 nm from Heron Point Light. You steer 039°T at 9.0 kn until 1315, then 232°T at 4.4 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  

8. At 1140 you fix your position 034°T, 3.4 nm from Heron Point Light. You steer 194°T at 4.6 kn until 1210, then 230°T at 4.3 kn until 1220.

   Give the 1220 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