Worksheet 256 · Skill 3

Dead reckoning

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1. At 1045 you fix your position 260°T, 3.0 nm from Gannet Rock daybeacon. You steer 246°T at 7.2 kn until 1055, then 334°T at 8.2 kn until 1105.

   Give the 1105 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  

2. At 1015 you fix your position 042°T, 4.7 nm from Westfield church spire. You steer 197°T at 5.4 kn until 1055, then 061°T at 5.6 kn until 1130.

   Give the 1130 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 0820 you fix your position 254°T, 0.9 nm from Gannet Rock daybeacon. You steer 147°T at 4.9 kn until 0840, then 315°T at 9.5 kn until 0905.

   Give the 0905 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 1315 you fix your position 248°T, 2.0 nm from Tern Island tower. You steer 218°T at 5.7 kn until 1330, then 001°T at 4.9 kn until 1345.

   Give the 1345 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  

5. At 0750 you fix your position 060°T, 3.2 nm from Heron Point Light. You steer 316°T at 9.8 kn until 0800, then 119°T at 7.7 kn until 0845.

   Give the 0845 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 0740 you fix your position 027°T, 2.4 nm from Westfield church spire. You steer 123°T at 5.6 kn until 0755, then 328°T at 5.4 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  

7. At 1545 you fix your position 037°T, 3.3 nm from Heron Point Light. You steer 044°T at 4.9 kn until 1605, then 242°T at 4.6 kn until 1630.

   Give the 1630 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 0725 you fix your position 284°T, 1.6 nm from Gannet Rock daybeacon. You steer 274°T at 5.3 kn until 0810, then 140°T at 8.0 kn until 0830.

   Give the 0830 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