Worksheet 644 · Skill 3

Dead reckoning

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1. At 1330 you fix your position 009°T, 2.0 nm from Gannet Rock daybeacon. You steer 024°T at 7.1 kn until 1355, then 186°T at 8.9 kn until 1415.

   Give the 1415 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 0945 you fix your position 292°T, 3.0 nm from Tern Island tower. You steer 066°T at 4.2 kn until 1000, then 230°T at 4.7 kn until 1030.

   Give the 1030 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 0855 you fix your position 355°T, 2.1 nm from Mill stack. You steer 325°T at 7.1 kn until 0905, then 075°T at 4.7 kn until 0945.

   Give the 0945 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 0745 you fix your position 058°T, 2.6 nm from Heron Point Light. You steer 127°T at 7.1 kn until 0800, then 340°T at 5.3 kn until 0830.

   Give the 0830 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 0940 you fix your position 014°T, 2.6 nm from Mill stack. You steer 328°T at 5.6 kn until 1005, then 183°T at 6.7 kn until 1030.

   Give the 1030 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  

6. At 1230 you fix your position 057°T, 3.4 nm from Westfield church spire. You steer 350°T at 5.8 kn until 1240, then 068°T at 4.4 kn until 1250.

   Give the 1250 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 1520 you fix your position 001°T, 1.1 nm from Heron Point Light. You steer 084°T at 5.0 kn until 1550, then 154°T at 8.2 kn until 1600.

   Give the 1600 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  

8. At 1150 you fix your position 281°T, 3.5 nm from Tern Island tower. You steer 224°T at 8.7 kn until 1205, then 328°T at 8.1 kn until 1230.

   Give the 1230 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