Worksheet 211 · Skill 3

Dead reckoning

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1. At 1200 you fix your position 224°T, 2.4 nm from Gannet Rock daybeacon. You steer 327°T at 9.2 kn until 1225, then 271°T at 4.8 kn until 1240.

   Give the 1240 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  

2. At 1100 you fix your position 300°T, 1.7 nm from Tern Island tower. You steer 322°T at 8.3 kn until 1110, then 217°T at 9.0 kn until 1140.

   Give the 1140 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  

3. At 0700 you fix your position 063°T, 3.3 nm from Tern Island tower. You steer 287°T at 4.8 kn until 0725, then 116°T at 5.5 kn until 0800.

   Give the 0800 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  

4. At 1320 you fix your position 265°T, 3.7 nm from Tern Island tower. You steer 042°T at 7.7 kn until 1330, then 141°T at 7.9 kn until 1415.

   Give the 1415 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 1005 you fix your position 144°T, 1.2 nm from Westfield church spire. You steer 120°T at 8.8 kn until 1045, then 063°T at 8.4 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  

6. At 1200 you fix your position 065°T, 2.8 nm from Tern Island tower. You steer 298°T at 4.5 kn until 1240, then 115°T at 5.1 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  

7. At 1350 you fix your position 351°T, 2.6 nm from Mill stack. You steer 358°T at 7.6 kn until 1410, then 072°T at 7.3 kn until 1420.

   Give the 1420 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 0905 you fix your position 127°T, 1.6 nm from Westfield church spire. You steer 048°T at 7.0 kn until 0935, then 337°T at 9.1 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