Worksheet 512 · Skill 3

Dead reckoning

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1. At 0750 you fix your position 045°T, 1.8 nm from Heron Point Light. You steer 112°T at 8.0 kn until 0810, then 003°T at 6.6 kn until 0855.

   Give the 0855 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 1235 you fix your position 021°T, 1.9 nm from Tern Island tower. You steer 258°T at 8.7 kn until 1245, then 306°T at 5.6 kn until 1255.

   Give the 1255 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 1105 you fix your position 043°T, 1.8 nm from Gannet Rock daybeacon. You steer 334°T at 7.5 kn until 1120, then 272°T at 6.5 kn until 1130.

   Give the 1130 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 1455 you fix your position 224°T, 2.3 nm from Tern Island tower. You steer 340°T at 6.9 kn until 1520, then 157°T at 6.4 kn until 1545.

   Give the 1545 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 1405 you fix your position 084°T, 2.6 nm from Tern Island tower. You steer 205°T at 4.2 kn until 1435, then 066°T at 6.9 kn until 1500.

   Give the 1500 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 1115 you fix your position 052°T, 3.6 nm from Tern Island tower. You steer 179°T at 4.5 kn until 1200, then 331°T at 6.7 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 1600 you fix your position 237°T, 2.8 nm from Tern Island tower. You steer 243°T at 6.5 kn until 1630, then 016°T at 5.9 kn until 1650.

   Give the 1650 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  

8. At 0725 you fix your position 059°T, 1.1 nm from Heron Point Light. You steer 297°T at 9.9 kn until 0735, then 118°T at 9.1 kn until 0800.

   Give the 0800 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