Worksheet 517 · Skill 3

Dead reckoning

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1. At 1100 you fix your position 289°T, 2.8 nm from Tern Island tower. You steer 192°T at 6.7 kn until 1125, then 120°T at 8.7 kn until 1155.

   Give the 1155 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 0950 you fix your position 229°T, 2.2 nm from Tern Island tower. You steer 277°T at 6.5 kn until 1010, then 335°T at 4.6 kn until 1040.

   Give the 1040 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  

3. At 1320 you fix your position 034°T, 2.1 nm from Mill stack. You steer 064°T at 9.8 kn until 1330, then 266°T at 5.2 kn until 1350.

   Give the 1350 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 1505 you fix your position 143°T, 1.3 nm from Gannet Rock daybeacon. You steer 215°T at 6.0 kn until 1520, then 347°T at 6.4 kn until 1550.

   Give the 1550 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 1040 you fix your position 037°T, 3.5 nm from Heron Point Light. You steer 255°T at 6.0 kn until 1105, then 103°T at 5.7 kn until 1125.

   Give the 1125 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  

6. At 1440 you fix your position 070°T, 2.1 nm from Heron Point Light. You steer 359°T at 4.6 kn until 1505, then 324°T at 5.2 kn until 1545.

   Give the 1545 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 1500 you fix your position 276°T, 2.1 nm from Gannet Rock daybeacon. You steer 274°T at 6.0 kn until 1510, then 127°T at 4.9 kn until 1540.

   Give the 1540 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 1505 you fix your position 220°T, 2.8 nm from Tern Island tower. You steer 143°T at 4.4 kn until 1525, then 352°T at 7.9 kn until 1555.

   Give the 1555 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