Worksheet 238 · Skill 3

Dead reckoning

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1. At 0710 you fix your position 262°T, 3.1 nm from Tern Island tower. You steer 101°T at 7.4 kn until 0720, then 305°T at 9.1 kn until 0740.

   Give the 0740 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 0910 you fix your position 063°T, 3.4 nm from Tern Island tower. You steer 200°T at 4.3 kn until 0950, then 154°T at 8.2 kn until 1005.

   Give the 1005 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 1315 you fix your position 073°T, 3.7 nm from Westfield church spire. You steer 069°T at 5.2 kn until 1325, then 260°T at 4.8 kn until 1335.

   Give the 1335 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 1425 you fix your position 033°T, 2.0 nm from Heron Point Light. You steer 123°T at 6.1 kn until 1500, then 312°T at 7.0 kn until 1540.

   Give the 1540 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 1215 you fix your position 046°T, 2.9 nm from Heron Point Light. You steer 265°T at 4.6 kn until 1250, then 057°T at 7.4 kn until 1325.

   Give the 1325 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 0820 you fix your position 233°T, 1.7 nm from Tern Island tower. You steer 100°T at 8.9 kn until 0835, then 191°T at 4.7 kn until 0920.

   Give the 0920 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  

7. At 1555 you fix your position 056°T, 1.9 nm from Westfield church spire. You steer 357°T at 9.4 kn until 1605, then 164°T at 6.8 kn until 1635.

   Give the 1635 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 1040 you fix your position 243°T, 2.9 nm from Tern Island tower. You steer 023°T at 8.1 kn until 1110, then 107°T at 8.5 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