Worksheet 106 · Skill 3

Dead reckoning

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1. At 1530 you fix your position 214°T, 2.0 nm from Tern Island tower. You steer 243°T at 4.1 kn until 1605, then 084°T at 5.1 kn until 1645.

   Give the 1645 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 1425 you fix your position 038°T, 4.3 nm from Westfield church spire. You steer 158°T at 9.9 kn until 1455, then 067°T at 7.4 kn until 1510.

   Give the 1510 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 1435 you fix your position 007°T, 2.0 nm from Mill stack. You steer 342°T at 5.0 kn until 1510, then 269°T at 8.3 kn until 1520.

   Give the 1520 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 1510 you fix your position 062°T, 2.7 nm from Gannet Rock daybeacon. You steer 094°T at 4.1 kn until 1520, then 321°T at 6.0 kn until 1550.

   Give the 1550 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 1230 you fix your position 226°T, 2.2 nm from Gannet Rock daybeacon. You steer 332°T at 9.2 kn until 1310, then 097°T at 7.0 kn until 1320.

   Give the 1320 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 0830 you fix your position 085°T, 3.1 nm from Westfield church spire. You steer 101°T at 4.2 kn until 0905, then 028°T at 4.3 kn until 0915.

   Give the 0915 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 1455 you fix your position 035°T, 3.4 nm from Gannet Rock daybeacon. You steer 105°T at 4.7 kn until 1510, then 204°T at 4.4 kn until 1525.

   Give the 1525 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 0755 you fix your position 037°T, 4.9 nm from Gannet Rock daybeacon. You steer 207°T at 7.4 kn until 0805, then 101°T at 4.8 kn until 0815.

   Give the 0815 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