Worksheet 507 · Skill 3

Dead reckoning

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1. At 1240 you fix your position 272°T, 1.9 nm from Tern Island tower. You steer 132°T at 7.7 kn until 1300, then 221°T at 8.8 kn until 1320.

   Give the 1320 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 1325 you fix your position 158°T, 1.2 nm from Tern Island tower. You steer 259°T at 7.4 kn until 1405, then 133°T at 6.3 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  

3. At 0740 you fix your position 041°T, 2.8 nm from Heron Point Light. You steer 007°T at 7.6 kn until 0800, then 155°T at 7.4 kn until 0835.

   Give the 0835 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  

4. At 1100 you fix your position 280°T, 3.5 nm from Tern Island tower. You steer 131°T at 8.8 kn until 1140, then 084°T at 6.5 kn until 1200.

   Give the 1200 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 1220 you fix your position 276°T, 3.4 nm from Tern Island tower. You steer 173°T at 9.8 kn until 1255, then 352°T at 8.9 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 1135 you fix your position 071°T, 3.0 nm from Westfield church spire. You steer 134°T at 4.8 kn until 1145, then 231°T at 4.9 kn until 1200.

   Give the 1200 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 1345 you fix your position 339°T, 2.4 nm from Mill stack. You steer 084°T at 5.8 kn until 1425, then 336°T at 5.4 kn until 1450.

   Give the 1450 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 1520 you fix your position 054°T, 3.8 nm from Westfield church spire. You steer 148°T at 7.7 kn until 1530, then 260°T at 6.5 kn until 1550.

   Give the 1550 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