Worksheet 514 · Skill 3

Dead reckoning

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1. At 1235 you fix your position 196°T, 1.8 nm from Gannet Rock daybeacon. You steer 253°T at 5.5 kn until 1315, then 333°T at 6.1 kn until 1340.

   Give the 1340 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  

2. At 1025 you fix your position 134°T, 1.3 nm from Westfield church spire. You steer 046°T at 9.7 kn until 1050, then 183°T at 9.0 kn until 1125.

   Give the 1125 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  

3. At 1240 you fix your position 292°T, 3.2 nm from Tern Island tower. You steer 165°T at 7.8 kn until 1250, then 079°T at 7.4 kn until 1300.

   Give the 1300 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 0905 you fix your position 261°T, 1.9 nm from Gannet Rock daybeacon. You steer 236°T at 9.6 kn until 0920, then 044°T at 8.2 kn until 0935.

   Give the 0935 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 0825 you fix your position 093°T, 3.1 nm from Westfield church spire. You steer 059°T at 9.0 kn until 0845, then 250°T at 8.7 kn until 0900.

   Give the 0900 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 1055 you fix your position 072°T, 2.7 nm from Westfield church spire. You steer 161°T at 8.8 kn until 1105, then 087°T at 7.8 kn until 1150.

   Give the 1150 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  

7. At 1510 you fix your position 083°T, 1.0 nm from Heron Point Light. You steer 017°T at 5.9 kn until 1550, then 344°T at 4.5 kn until 1615.

   Give the 1615 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  

8. At 0705 you fix your position 262°T, 2.8 nm from Gannet Rock daybeacon. You steer 247°T at 5.0 kn until 0750, then 092°T at 9.7 kn until 0810.

   Give the 0810 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