Worksheet 236 · Skill 3

Dead reckoning

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1. At 0855 you fix your position 034°T, 3.8 nm from Gannet Rock daybeacon. You steer 177°T at 5.9 kn until 0925, then 251°T at 4.1 kn until 0950.

   Give the 0950 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

2. At 0730 you fix your position 025°T, 2.7 nm from Mill stack. You steer 022°T at 7.1 kn until 0740, then 238°T at 7.7 kn until 0800.

   Give the 0800 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 1120 you fix your position 003°T, 2.0 nm from Heron Point Light. You steer 040°T at 6.6 kn until 1200, then 247°T at 6.4 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  

4. At 1105 you fix your position 063°T, 2.4 nm from Heron Point Light. You steer 107°T at 8.9 kn until 1140, then 043°T at 9.7 kn until 1205.

   Give the 1205 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 1000 you fix your position 191°T, 2.0 nm from Tern Island tower. You steer 201°T at 5.6 kn until 1015, then 163°T at 6.6 kn until 1030.

   Give the 1030 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 0825 you fix your position 004°T, 1.6 nm from Westfield church spire. You steer 104°T at 8.7 kn until 0835, then 154°T at 4.6 kn until 0905.

   Give the 0905 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  

7. At 1555 you fix your position 254°T, 2.4 nm from Tern Island tower. You steer 204°T at 5.8 kn until 1610, then 300°T at 10.0 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 1305 you fix your position 186°T, 1.3 nm from Tern Island tower. You steer 264°T at 7.0 kn until 1345, then 003°T at 6.9 kn until 1405.

   Give the 1405 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