Worksheet 80 · Skill 3

Dead reckoning

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1. At 0930 you fix your position 076°T, 1.9 nm from Heron Point Light. You steer 329°T at 4.1 kn until 0940, then 120°T at 6.3 kn until 0955.

   Give the 0955 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  

2. At 1215 you fix your position 316°T, 3.1 nm from Tern Island tower. You steer 221°T at 8.2 kn until 1235, then 075°T at 4.2 kn until 1305.

   Give the 1305 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 1405 you fix your position 104°T, 1.4 nm from Westfield church spire. You steer 035°T at 4.6 kn until 1430, then 108°T at 5.4 kn until 1515.

   Give the 1515 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 0820 you fix your position 083°T, 1.6 nm from Tern Island tower. You steer 143°T at 7.1 kn until 0855, then 338°T at 6.7 kn until 0925.

   Give the 0925 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  

5. At 1425 you fix your position 236°T, 1.5 nm from Gannet Rock daybeacon. You steer 103°T at 9.0 kn until 1440, then 306°T at 4.8 kn until 1520.

   Give the 1520 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 1450 you fix your position 027°T, 2.4 nm from Westfield church spire. You steer 071°T at 4.8 kn until 1505, then 160°T at 4.1 kn until 1520.

   Give the 1520 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 1420 you fix your position 332°T, 1.3 nm from Tern Island tower. You steer 056°T at 5.3 kn until 1440, then 098°T at 7.3 kn until 1500.

   Give the 1500 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  

8. At 0855 you fix your position 275°T, 0.9 nm from Gannet Rock daybeacon. You steer 304°T at 9.4 kn until 0920, then 340°T at 5.7 kn until 0935.

   Give the 0935 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