Worksheet 208 · Skill 3

Dead reckoning

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1. At 1050 you fix your position 277°T, 1.9 nm from Tern Island tower. You steer 278°T at 5.2 kn until 1105, then 126°T at 9.6 kn until 1130.

   Give the 1130 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 0840 you fix your position 337°T, 2.4 nm from Tern Island tower. You steer 247°T at 7.4 kn until 0910, then 163°T at 9.9 kn until 0945.

   Give the 0945 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 1235 you fix your position 300°T, 1.7 nm from Tern Island tower. You steer 070°T at 6.2 kn until 1320, then 217°T at 7.7 kn until 1340.

   Give the 1340 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 0825 you fix your position 206°T, 1.6 nm from Gannet Rock daybeacon. You steer 269°T at 7.2 kn until 0905, then 080°T at 6.7 kn until 0925.

   Give the 0925 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  

5. At 1350 you fix your position 298°T, 3.9 nm from Tern Island tower. You steer 188°T at 7.3 kn until 1430, then 032°T at 7.1 kn until 1505.

   Give the 1505 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  

6. At 0720 you fix your position 276°T, 2.5 nm from Tern Island tower. You steer 020°T at 5.4 kn until 0735, then 311°T at 5.2 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  

7. At 1135 you fix your position 329°T, 2.2 nm from Tern Island tower. You steer 088°T at 9.5 kn until 1200, then 194°T at 4.1 kn until 1240.

   Give the 1240 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  

8. At 1225 you fix your position 059°T, 3.7 nm from Westfield church spire. You steer 180°T at 7.8 kn until 1240, then 045°T at 5.4 kn until 1250.

   Give the 1250 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