Worksheet 742 · Skill 3

Dead reckoning

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1. At 1130 you fix your position 065°T, 2.9 nm from Heron Point Light. You steer 328°T at 4.1 kn until 1155, then 284°T at 4.9 kn until 1215.

   Give the 1215 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 1430 you fix your position 054°T, 2.8 nm from Heron Point Light. You steer 038°T at 5.2 kn until 1440, then 160°T at 8.6 kn until 1455.

   Give the 1455 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  

3. At 0945 you fix your position 031°T, 2.6 nm from Heron Point Light. You steer 266°T at 4.8 kn until 1010, then 015°T at 5.8 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  

4. At 1000 you fix your position 221°T, 3.3 nm from Tern Island tower. You steer 322°T at 6.0 kn until 1010, then 201°T at 4.0 kn until 1045.

   Give the 1045 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  

5. At 1520 you fix your position 319°T, 1.4 nm from Tern Island tower. You steer 319°T at 6.6 kn until 1530, then 200°T at 5.5 kn until 1600.

   Give the 1600 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 1130 you fix your position 042°T, 3.3 nm from Gannet Rock daybeacon. You steer 248°T at 8.8 kn until 1200, then 279°T at 7.0 kn until 1245.

   Give the 1245 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 1525 you fix your position 044°T, 4.3 nm from Westfield church spire. You steer 115°T at 4.5 kn until 1540, then 232°T at 4.1 kn until 1625.

   Give the 1625 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 0835 you fix your position 346°T, 2.5 nm from Tern Island tower. You steer 103°T at 8.1 kn until 0850, then 238°T at 9.0 kn until 0900.

   Give the 0900 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