Worksheet 143 · Skill 3

Dead reckoning

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1. At 1510 you fix your position 045°T, 2.7 nm from Tern Island tower. You steer 072°T at 5.8 kn until 1520, then 121°T at 9.9 kn until 1535.

   Give the 1535 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 0905 you fix your position 016°T, 2.5 nm from Mill stack. You steer 240°T at 7.9 kn until 0915, then 324°T at 7.8 kn until 0940.

   Give the 0940 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  

3. At 0845 you fix your position 249°T, 3.0 nm from Tern Island tower. You steer 159°T at 4.5 kn until 0920, then 232°T at 9.4 kn until 0935.

   Give the 0935 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  

4. At 0845 you fix your position 304°T, 3.2 nm from Tern Island tower. You steer 221°T at 8.0 kn until 0925, then 000°T at 8.1 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  

5. At 0950 you fix your position 058°T, 2.9 nm from Heron Point Light. You steer 286°T at 8.1 kn until 1015, then 091°T at 8.0 kn until 1050.

   Give the 1050 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 1155 you fix your position 340°T, 2.4 nm from Mill stack. You steer 341°T at 9.9 kn until 1205, then 095°T at 4.8 kn until 1225.

   Give the 1225 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 1355 you fix your position 020°T, 2.1 nm from Tern Island tower. You steer 131°T at 9.9 kn until 1420, then 212°T at 4.5 kn until 1430.

   Give the 1430 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 1215 you fix your position 255°T, 3.6 nm from Tern Island tower. You steer 311°T at 8.6 kn until 1245, then 169°T at 8.8 kn until 1310.

   Give the 1310 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