Worksheet 406 · Skill 3

Dead reckoning

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1. At 1235 you fix your position 345°T, 1.7 nm from Mill stack. You steer 274°T at 4.3 kn until 1250, then 065°T at 5.8 kn until 1315.

   Give the 1315 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 0845 you fix your position 005°T, 2.1 nm from Heron Point Light. You steer 008°T at 5.4 kn until 0930, then 095°T at 6.7 kn until 0945.

   Give the 0945 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 1040 you fix your position 027°T, 2.2 nm from Mill stack. You steer 080°T at 9.8 kn until 1110, then 141°T at 8.0 kn until 1120.

   Give the 1120 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

4. At 1010 you fix your position 013°T, 2.9 nm from Mill stack. You steer 298°T at 5.2 kn until 1020, then 068°T at 7.7 kn until 1105.

   Give the 1105 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  

5. At 1135 you fix your position 012°T, 1.9 nm from Mill stack. You steer 287°T at 8.4 kn until 1150, then 057°T at 6.4 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  

6. At 0955 you fix your position 117°T, 1.7 nm from Westfield church spire. You steer 066°T at 6.1 kn until 1040, then 273°T at 9.8 kn until 1100.

   Give the 1100 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 1555 you fix your position 039°T, 4.1 nm from Westfield church spire. You steer 097°T at 4.1 kn until 1630, then 234°T at 9.4 kn until 1700.

   Give the 1700 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 1445 you fix your position 240°T, 2.4 nm from Tern Island tower. You steer 262°T at 6.9 kn until 1500, then 204°T at 4.4 kn until 1520.

   Give the 1520 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