Worksheet 757 · Skill 3

Dead reckoning

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1. At 0815 you fix your position 272°T, 2.7 nm from Tern Island tower. You steer 069°T at 4.4 kn until 0835, then 249°T at 9.4 kn until 0910.

   Give the 0910 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 0945 you fix your position 161°T, 1.0 nm from Westfield church spire. You steer 069°T at 9.3 kn until 0955, then 185°T at 5.0 kn until 1020.

   Give the 1020 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  

3. At 1255 you fix your position 086°T, 3.5 nm from Westfield church spire. You steer 225°T at 5.3 kn until 1325, then 352°T at 7.5 kn until 1350.

   Give the 1350 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  

4. At 0715 you fix your position 074°T, 3.0 nm from Westfield church spire. You steer 127°T at 7.9 kn until 0735, then 313°T at 9.5 kn until 0805.

   Give the 0805 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 0735 you fix your position 005°T, 2.6 nm from Mill stack. You steer 304°T at 6.7 kn until 0815, then 146°T at 7.9 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  

6. At 1025 you fix your position 284°T, 1.5 nm from Tern Island tower. You steer 236°T at 8.0 kn until 1105, then 346°T at 7.7 kn until 1120.

   Give the 1120 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 1435 you fix your position 042°T, 2.7 nm from Westfield church spire. You steer 070°T at 6.7 kn until 1510, then 238°T at 8.7 kn until 1520.

   Give the 1520 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 0825 you fix your position 080°T, 2.5 nm from Tern Island tower. You steer 153°T at 7.8 kn until 0900, then 330°T at 7.2 kn until 0940.

   Give the 0940 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