Worksheet 568 · Skill 3

Dead reckoning

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1. At 0705 you fix your position 121°T, 1.9 nm from Westfield church spire. You steer 072°T at 6.3 kn until 0730, then 170°T at 7.7 kn until 0745.

   Give the 0745 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  

2. At 1245 you fix your position 083°T, 2.2 nm from Gannet Rock daybeacon. You steer 026°T at 9.8 kn until 1300, then 251°T at 4.1 kn until 1315.

   Give the 1315 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 0810 you fix your position 224°T, 3.1 nm from Tern Island tower. You steer 077°T at 4.3 kn until 0820, then 255°T at 7.9 kn until 0830.

   Give the 0830 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  

4. At 1350 you fix your position 304°T, 2.5 nm from Tern Island tower. You steer 047°T at 9.5 kn until 1400, then 269°T at 7.0 kn until 1445.

   Give the 1445 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  

5. At 1335 you fix your position 061°T, 3.2 nm from Westfield church spire. You steer 160°T at 4.0 kn until 1345, then 199°T at 7.8 kn until 1405.

   Give the 1405 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 1040 you fix your position 047°T, 3.4 nm from Heron Point Light. You steer 253°T at 5.9 kn until 1105, then 359°T at 4.6 kn until 1140.

   Give the 1140 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 1425 you fix your position 082°T, 2.3 nm from Gannet Rock daybeacon. You steer 180°T at 7.1 kn until 1435, then 348°T at 6.6 kn until 1505.

   Give the 1505 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 1510 you fix your position 268°T, 1.8 nm from Gannet Rock daybeacon. You steer 035°T at 8.3 kn until 1545, then 166°T at 4.3 kn until 1620.

   Give the 1620 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