Worksheet 543 · Skill 3

Dead reckoning

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1. At 1345 you fix your position 025°T, 2.1 nm from Westfield church spire. You steer 121°T at 6.3 kn until 1415, then 078°T at 5.7 kn until 1430.

   Give the 1430 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 1205 you fix your position 353°T, 1.4 nm from Gannet Rock daybeacon. You steer 230°T at 8.2 kn until 1235, then 281°T at 6.6 kn until 1310.

   Give the 1310 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 053°T, 3.2 nm from Westfield church spire. You steer 167°T at 6.1 kn until 0905, then 135°T at 5.1 kn until 0925.

   Give the 0925 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 1525 you fix your position 296°T, 2.5 nm from Tern Island tower. You steer 295°T at 9.5 kn until 1540, then 225°T at 6.7 kn until 1555.

   Give the 1555 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 1015 you fix your position 078°T, 2.8 nm from Westfield church spire. You steer 174°T at 9.6 kn until 1030, then 086°T at 6.5 kn until 1045.

   Give the 1045 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  

6. At 1210 you fix your position 120°T, 2.2 nm from Westfield church spire. You steer 036°T at 5.1 kn until 1245, then 210°T at 4.6 kn until 1315.

   Give the 1315 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  

7. At 0845 you fix your position 036°T, 2.3 nm from Gannet Rock daybeacon. You steer 244°T at 5.5 kn until 0855, then 057°T at 8.5 kn until 0910.

   Give the 0910 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 1500 you fix your position 015°T, 2.9 nm from Mill stack. You steer 342°T at 9.0 kn until 1540, then 202°T at 7.8 kn until 1615.

   Give the 1615 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