Worksheet 131 · Skill 3

Dead reckoning

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1. At 0945 you fix your position 157°T, 1.4 nm from Gannet Rock daybeacon. You steer 021°T at 9.3 kn until 1005, then 307°T at 9.6 kn until 1020.

   Give the 1020 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 0915 you fix your position 250°T, 2.1 nm from Tern Island tower. You steer 302°T at 10.0 kn until 0930, then 127°T at 9.2 kn until 0950.

   Give the 0950 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  

3. At 0725 you fix your position 033°T, 1.2 nm from Westfield church spire. You steer 057°T at 5.9 kn until 0805, then 270°T at 6.4 kn until 0820.

   Give the 0820 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  

4. At 1050 you fix your position 045°T, 2.8 nm from Heron Point Light. You steer 085°T at 7.4 kn until 1120, then 236°T at 6.9 kn until 1145.

   Give the 1145 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 1330 you fix your position 322°T, 1.4 nm from Tern Island tower. You steer 285°T at 4.7 kn until 1355, then 099°T at 9.0 kn until 1440.

   Give the 1440 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 1035 you fix your position 084°T, 2.6 nm from Gannet Rock daybeacon. You steer 297°T at 5.4 kn until 1110, then 002°T at 4.7 kn until 1135.

   Give the 1135 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 1345 you fix your position 276°T, 3.7 nm from Tern Island tower. You steer 140°T at 8.2 kn until 1425, then 303°T at 6.9 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  

8. At 0755 you fix your position 205°T, 2.0 nm from Gannet Rock daybeacon. You steer 012°T at 4.0 kn until 0835, then 226°T at 5.2 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