Worksheet 506 · Skill 3

Dead reckoning

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1. At 1105 you fix your position 306°T, 3.3 nm from Tern Island tower. You steer 203°T at 9.7 kn until 1135, then 260°T at 5.6 kn until 1155.

   Give the 1155 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 1040 you fix your position 065°T, 2.2 nm from Westfield church spire. You steer 163°T at 6.6 kn until 1055, then 051°T at 10.0 kn until 1135.

   Give the 1135 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 0730 you fix your position 090°T, 2.0 nm from Gannet Rock daybeacon. You steer 309°T at 4.2 kn until 0810, then 220°T at 9.9 kn until 0845.

   Give the 0845 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  

4. At 0735 you fix your position 283°T, 3.6 nm from Tern Island tower. You steer 148°T at 6.2 kn until 0820, then 048°T at 6.0 kn until 0840.

   Give the 0840 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 1315 you fix your position 353°T, 1.5 nm from Heron Point Light. You steer 006°T at 4.5 kn until 1400, then 060°T at 8.5 kn until 1430.

   Give the 1430 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 0830 you fix your position 039°T, 3.4 nm from Heron Point Light. You steer 260°T at 8.5 kn until 0840, then 050°T at 5.9 kn until 0910.

   Give the 0910 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 1010 you fix your position 075°T, 2.4 nm from Westfield church spire. You steer 353°T at 8.9 kn until 1025, then 161°T at 4.5 kn until 1035.

   Give the 1035 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 0910 you fix your position 118°T, 2.0 nm from Gannet Rock daybeacon. You steer 137°T at 5.4 kn until 0930, then 349°T at 7.7 kn until 0955.

   Give the 0955 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