Worksheet 553 · Skill 3

Dead reckoning

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1. At 1415 you fix your position 047°T, 2.3 nm from Mill stack. You steer 333°T at 5.9 kn until 1425, then 219°T at 6.7 kn until 1435.

   Give the 1435 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 0820 you fix your position 285°T, 2.9 nm from Tern Island tower. You steer 083°T at 5.5 kn until 0850, then 025°T at 4.8 kn until 0900.

   Give the 0900 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 0815 you fix your position 017°T, 2.0 nm from Heron Point Light. You steer 347°T at 5.3 kn until 0825, then 055°T at 8.9 kn until 0900.

   Give the 0900 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 1425 you fix your position 061°T, 4.4 nm from Tern Island tower. You steer 219°T at 6.0 kn until 1455, then 017°T at 5.1 kn until 1525.

   Give the 1525 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 0830 you fix your position 107°T, 1.1 nm from Gannet Rock daybeacon. You steer 347°T at 8.7 kn until 0850, then 056°T at 5.9 kn until 0900.

   Give the 0900 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 0740 you fix your position 031°T, 1.8 nm from Westfield church spire. You steer 181°T at 9.3 kn until 0800, then 064°T at 5.1 kn until 0820.

   Give the 0820 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 1415 you fix your position 131°T, 1.4 nm from Gannet Rock daybeacon. You steer 262°T at 9.1 kn until 1455, then 080°T at 4.9 kn until 1535.

   Give the 1535 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 016°T, 2.6 nm from Mill stack. You steer 045°T at 5.4 kn until 0900, then 161°T at 4.1 kn until 0910.

   Give the 0910 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