Worksheet 231 · Skill 3

Dead reckoning

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1. At 0845 you fix your position 359°T, 2.0 nm from Westfield church spire. You steer 072°T at 5.5 kn until 0900, then 180°T at 5.1 kn until 0930.

   Give the 0930 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 1210 you fix your position 264°T, 2.7 nm from Gannet Rock daybeacon. You steer 210°T at 4.3 kn until 1235, then 061°T at 6.9 kn until 1245.

   Give the 1245 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 1600 you fix your position 176°T, 1.6 nm from Gannet Rock daybeacon. You steer 319°T at 6.9 kn until 1620, then 238°T at 6.7 kn until 1650.

   Give the 1650 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  

4. At 0840 you fix your position 009°T, 1.2 nm from Gannet Rock daybeacon. You steer 166°T at 5.1 kn until 0915, then 259°T at 4.8 kn until 0940.

   Give the 0940 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 1310 you fix your position 042°T, 2.3 nm from Tern Island tower. You steer 087°T at 6.0 kn until 1320, then 177°T at 9.7 kn until 1350.

   Give the 1350 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 0735 you fix your position 301°T, 3.5 nm from Tern Island tower. You steer 093°T at 7.6 kn until 0810, then 123°T at 6.6 kn until 0845.

   Give the 0845 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 1220 you fix your position 041°T, 1.9 nm from Gannet Rock daybeacon. You steer 206°T at 4.5 kn until 1300, then 269°T at 5.1 kn until 1335.

   Give the 1335 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  

8. At 1340 you fix your position 040°T, 4.0 nm from Westfield church spire. You steer 118°T at 4.6 kn until 1420, then 037°T at 7.5 kn until 1440.

   Give the 1440 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