Worksheet 33 · Skill 3

Dead reckoning

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1. At 1145 you fix your position 273°T, 3.7 nm from Tern Island tower. You steer 154°T at 5.3 kn until 1225, then 004°T at 6.2 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  

2. At 1105 you fix your position 074°T, 2.3 nm from Gannet Rock daybeacon. You steer 165°T at 9.2 kn until 1115, then 316°T at 5.4 kn until 1130.

   Give the 1130 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  

3. At 1500 you fix your position 282°T, 2.4 nm from Tern Island tower. You steer 021°T at 4.6 kn until 1520, then 185°T at 5.8 kn until 1535.

   Give the 1535 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 1515 you fix your position 338°T, 2.3 nm from Mill stack. You steer 311°T at 7.5 kn until 1550, then 076°T at 8.2 kn until 1620.

   Give the 1620 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 1240 you fix your position 041°T, 4.1 nm from Westfield church spire. You steer 097°T at 5.4 kn until 1300, then 257°T at 7.9 kn until 1310.

   Give the 1310 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  

6. At 0705 you fix your position 026°T, 2.9 nm from Heron Point Light. You steer 149°T at 8.2 kn until 0735, then 303°T at 5.6 kn until 0800.

   Give the 0800 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  

7. At 1410 you fix your position 299°T, 1.5 nm from Gannet Rock daybeacon. You steer 187°T at 4.8 kn until 1435, then 284°T at 7.1 kn until 1450.

   Give the 1450 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 1525 you fix your position 244°T, 2.0 nm from Tern Island tower. You steer 330°T at 6.8 kn until 1535, then 207°T at 6.1 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