Worksheet 184 · Skill 3

Dead reckoning

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1. At 0735 you fix your position 038°T, 3.4 nm from Heron Point Light. You steer 182°T at 7.8 kn until 0750, then 068°T at 8.0 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  

2. At 0840 you fix your position 254°T, 3.2 nm from Tern Island tower. You steer 347°T at 5.9 kn until 0915, then 201°T at 4.9 kn until 0955.

   Give the 0955 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 1155 you fix your position 334°T, 1.7 nm from Tern Island tower. You steer 066°T at 6.7 kn until 1210, then 268°T at 7.0 kn until 1245.

   Give the 1245 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 1600 you fix your position 302°T, 4.3 nm from Tern Island tower. You steer 160°T at 7.5 kn until 1635, then 323°T at 7.2 kn until 1710.

   Give the 1710 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 1440 you fix your position 039°T, 2.5 nm from Mill stack. You steer 139°T at 6.1 kn until 1450, then 021°T at 6.5 kn until 1505.

   Give the 1505 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 1000 you fix your position 071°T, 2.2 nm from Westfield church spire. You steer 063°T at 9.9 kn until 1015, then 168°T at 8.1 kn until 1030.

   Give the 1030 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  

7. At 1115 you fix your position 295°T, 3.0 nm from Tern Island tower. You steer 229°T at 6.8 kn until 1150, then 105°T at 5.2 kn until 1225.

   Give the 1225 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 1035 you fix your position 285°T, 2.5 nm from Tern Island tower. You steer 156°T at 8.8 kn until 1055, then 358°T at 4.5 kn until 1140.

   Give the 1140 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