Worksheet 354 · Skill 3

Dead reckoning

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1. At 1510 you fix your position 033°T, 3.5 nm from Westfield church spire. You steer 110°T at 9.6 kn until 1530, then 296°T at 9.5 kn until 1555.

   Give the 1555 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 1030 you fix your position 248°T, 1.1 nm from Gannet Rock daybeacon. You steer 040°T at 7.6 kn until 1110, then 117°T at 6.9 kn until 1120.

   Give the 1120 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  

3. At 0715 you fix your position 326°T, 2.7 nm from Tern Island tower. You steer 228°T at 7.7 kn until 0730, then 035°T at 8.0 kn until 0745.

   Give the 0745 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 1345 you fix your position 349°T, 2.4 nm from Mill stack. You steer 306°T at 6.0 kn until 1430, then 191°T at 6.7 kn until 1440.

   Give the 1440 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 0700 you fix your position 062°T, 1.0 nm from Heron Point Light. You steer 063°T at 7.2 kn until 0745, then 227°T at 6.4 kn until 0815.

   Give the 0815 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 0720 you fix your position 055°T, 3.1 nm from Westfield church spire. You steer 114°T at 8.5 kn until 0740, then 336°T at 4.5 kn until 0800.

   Give the 0800 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 0830 you fix your position 038°T, 2.6 nm from Heron Point Light. You steer 307°T at 5.0 kn until 0910, then 351°T at 4.4 kn until 0945.

   Give the 0945 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 1220 you fix your position 263°T, 3.5 nm from Tern Island tower. You steer 245°T at 7.0 kn until 1230, then 018°T at 5.1 kn until 1250.

   Give the 1250 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