Worksheet 180 · Skill 3

Dead reckoning

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1. At 0945 you fix your position 123°T, 1.2 nm from Gannet Rock daybeacon. You steer 273°T at 9.6 kn until 1030, then 107°T at 7.4 kn until 1110.

   Give the 1110 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  

2. At 0850 you fix your position 342°T, 2.3 nm from Tern Island tower. You steer 205°T at 8.3 kn until 0930, then 108°T at 5.6 kn until 0950.

   Give the 0950 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 0715 you fix your position 042°T, 4.2 nm from Gannet Rock daybeacon. You steer 216°T at 7.3 kn until 0750, then 148°T at 6.0 kn until 0805.

   Give the 0805 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  

4. At 0700 you fix your position 214°T, 1.9 nm from Gannet Rock daybeacon. You steer 073°T at 5.0 kn until 0710, then 300°T at 4.9 kn until 0750.

   Give the 0750 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  

5. At 1515 you fix your position 020°T, 2.7 nm from Westfield church spire. You steer 349°T at 5.0 kn until 1525, then 161°T at 7.4 kn until 1535.

   Give the 1535 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  

6. At 1430 you fix your position 029°T, 3.7 nm from Westfield church spire. You steer 272°T at 5.5 kn until 1440, then 163°T at 8.2 kn until 1505.

   Give the 1505 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 1300 you fix your position 135°T, 1.6 nm from Westfield church spire. You steer 003°T at 6.8 kn until 1325, then 136°T at 8.4 kn until 1345.

   Give the 1345 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 1145 you fix your position 082°T, 1.7 nm from Westfield church spire. You steer 089°T at 8.7 kn until 1200, then 308°T at 5.8 kn until 1210.

   Give the 1210 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