Worksheet 657 · Skill 3

Dead reckoning

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1. At 1520 you fix your position 031°T, 2.3 nm from Heron Point Light. You steer 332°T at 7.3 kn until 1550, then 093°T at 8.0 kn until 1600.

   Give the 1600 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  

2. At 1525 you fix your position 009°T, 2.0 nm from Gannet Rock daybeacon. You steer 097°T at 4.4 kn until 1600, then 339°T at 6.1 kn until 1635.

   Give the 1635 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 0915 you fix your position 003°T, 1.8 nm from Gannet Rock daybeacon. You steer 042°T at 4.7 kn until 0930, then 341°T at 6.9 kn until 0945.

   Give the 0945 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 0855 you fix your position 331°T, 1.4 nm from Heron Point Light. You steer 090°T at 7.5 kn until 0905, then 025°T at 7.8 kn until 0925.

   Give the 0925 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 1400 you fix your position 090°T, 2.4 nm from Westfield church spire. You steer 074°T at 6.9 kn until 1430, then 230°T at 6.0 kn until 1450.

   Give the 1450 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 0950 you fix your position 046°T, 3.5 nm from Gannet Rock daybeacon. You steer 278°T at 6.2 kn until 1010, then 325°T at 9.5 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  

7. At 1320 you fix your position 064°T, 1.9 nm from Gannet Rock daybeacon. You steer 342°T at 8.3 kn until 1335, then 229°T at 6.2 kn until 1410.

   Give the 1410 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 0820 you fix your position 038°T, 2.3 nm from Heron Point Light. You steer 271°T at 6.8 kn until 0845, then 043°T at 6.5 kn until 0930.

   Give the 0930 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