Worksheet 362 · Skill 3

Dead reckoning

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1. At 1030 you fix your position 016°T, 2.0 nm from Heron Point Light. You steer 070°T at 6.7 kn until 1110, then 155°T at 8.8 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 1040 you fix your position 340°T, 1.6 nm from Mill stack. You steer 083°T at 4.4 kn until 1105, then 308°T at 8.6 kn until 1150.

   Give the 1150 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  

3. At 1425 you fix your position 056°T, 3.8 nm from Tern Island tower. You steer 199°T at 6.0 kn until 1435, then 127°T at 4.1 kn until 1455.

   Give the 1455 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 1150 you fix your position 143°T, 1.5 nm from Tern Island tower. You steer 101°T at 4.6 kn until 1200, then 263°T at 7.1 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  

5. At 0710 you fix your position 297°T, 2.8 nm from Tern Island tower. You steer 302°T at 8.0 kn until 0720, then 087°T at 9.9 kn until 0805.

   Give the 0805 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 0840 you fix your position 054°T, 3.4 nm from Westfield church spire. You steer 199°T at 9.6 kn until 0900, then 093°T at 6.7 kn until 0940.

   Give the 0940 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 1110 you fix your position 281°T, 3.8 nm from Tern Island tower. You steer 342°T at 4.4 kn until 1125, then 179°T at 6.5 kn until 1140.

   Give the 1140 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 1135 you fix your position 045°T, 4.5 nm from Westfield church spire. You steer 236°T at 5.1 kn until 1215, then 043°T at 8.5 kn until 1235.

   Give the 1235 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