Worksheet 137 · Skill 3

Dead reckoning

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1. At 0835 you fix your position 090°T, 2.7 nm from Westfield church spire. You steer 313°T at 5.2 kn until 0905, then 112°T at 8.9 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  

2. At 1035 you fix your position 265°T, 3.5 nm from Tern Island tower. You steer 223°T at 7.2 kn until 1105, then 097°T at 7.3 kn until 1140.

   Give the 1140 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 0745 you fix your position 204°T, 2.2 nm from Gannet Rock daybeacon. You steer 101°T at 6.9 kn until 0755, then 267°T at 9.1 kn until 0805.

   Give the 0805 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 0920 you fix your position 204°T, 1.4 nm from Gannet Rock daybeacon. You steer 005°T at 6.4 kn until 0945, then 040°T at 5.5 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  

5. At 1155 you fix your position 039°T, 2.5 nm from Tern Island tower. You steer 171°T at 4.9 kn until 1205, then 106°T at 7.6 kn until 1225.

   Give the 1225 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 0825 you fix your position 077°T, 3.0 nm from Westfield church spire. You steer 143°T at 8.2 kn until 0850, then 291°T at 6.6 kn until 0905.

   Give the 0905 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  

7. At 1215 you fix your position 307°T, 1.0 nm from Gannet Rock daybeacon. You steer 269°T at 4.8 kn until 1255, then 163°T at 6.7 kn until 1305.

   Give the 1305 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 1135 you fix your position 302°T, 1.5 nm from Tern Island tower. You steer 196°T at 8.2 kn until 1200, then 344°T at 5.4 kn until 1210.

   Give the 1210 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