Worksheet 329 · Skill 3

Dead reckoning

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1. At 0720 you fix your position 302°T, 4.4 nm from Tern Island tower. You steer 170°T at 4.0 kn until 0750, then 234°T at 4.5 kn until 0805.

   Give the 0805 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  

2. At 0950 you fix your position 044°T, 2.5 nm from Mill stack. You steer 339°T at 5.4 kn until 1005, then 054°T at 8.6 kn until 1040.

   Give the 1040 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 1230 you fix your position 330°T, 2.7 nm from Tern Island tower. You steer 178°T at 8.4 kn until 1315, then 081°T at 6.3 kn until 1340.

   Give the 1340 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 1305 you fix your position 262°T, 1.6 nm from Gannet Rock daybeacon. You steer 243°T at 9.8 kn until 1315, then 087°T at 6.9 kn until 1350.

   Give the 1350 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 1240 you fix your position 058°T, 4.5 nm from Tern Island tower. You steer 227°T at 5.2 kn until 1310, then 308°T at 7.6 kn until 1330.

   Give the 1330 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 1545 you fix your position 226°T, 1.9 nm from Tern Island tower. You steer 284°T at 5.9 kn until 1555, then 135°T at 4.0 kn until 1625.

   Give the 1625 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 0920 you fix your position 067°T, 2.9 nm from Westfield church spire. You steer 060°T at 5.2 kn until 1005, then 243°T at 7.5 kn until 1050.

   Give the 1050 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  

8. At 1400 you fix your position 092°T, 1.9 nm from Heron Point Light. You steer 057°T at 9.8 kn until 1445, then 328°T at 6.9 kn until 1455.

   Give the 1455 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