Worksheet 185 · Skill 3

Dead reckoning

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1. At 1020 you fix your position 027°T, 2.3 nm from Heron Point Light. You steer 247°T at 5.6 kn until 1030, then 294°T at 4.4 kn until 1045.

   Give the 1045 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 1410 you fix your position 142°T, 3.3 nm from Westfield church spire. You steer 056°T at 8.6 kn until 1440, then 283°T at 4.7 kn until 1525.

   Give the 1525 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 1020 you fix your position 022°T, 2.1 nm from Gannet Rock daybeacon. You steer 190°T at 4.3 kn until 1035, then 276°T at 9.4 kn until 1110.

   Give the 1110 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 1350 you fix your position 314°T, 2.1 nm from Tern Island tower. You steer 251°T at 4.8 kn until 1400, then 168°T at 5.3 kn until 1410.

   Give the 1410 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 1100 you fix your position 073°T, 2.9 nm from Tern Island tower. You steer 291°T at 4.1 kn until 1125, then 127°T at 6.4 kn until 1205.

   Give the 1205 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 1035 you fix your position 272°T, 2.3 nm from Gannet Rock daybeacon. You steer 303°T at 6.2 kn until 1055, then 124°T at 6.3 kn until 1120.

   Give the 1120 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  

7. At 0820 you fix your position 057°T, 3.6 nm from Tern Island tower. You steer 097°T at 10.0 kn until 0830, then 267°T at 7.8 kn until 0845.

   Give the 0845 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 0935 you fix your position 035°T, 1.6 nm from Heron Point Light. You steer 317°T at 7.5 kn until 0950, then 126°T at 6.5 kn until 1025.

   Give the 1025 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