Worksheet 620 · Skill 3

Dead reckoning

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1. At 1335 you fix your position 106°T, 1.6 nm from Gannet Rock daybeacon. You steer 271°T at 6.3 kn until 1345, then 101°T at 7.1 kn until 1400.

   Give the 1400 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 1455 you fix your position 087°T, 3.0 nm from Westfield church spire. You steer 096°T at 8.2 kn until 1505, then 358°T at 5.6 kn until 1540.

   Give the 1540 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  

3. At 0735 you fix your position 249°T, 1.6 nm from Gannet Rock daybeacon. You steer 190°T at 5.1 kn until 0755, then 090°T at 6.7 kn until 0805.

   Give the 0805 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

4. At 0710 you fix your position 064°T, 2.2 nm from Heron Point Light. You steer 296°T at 5.8 kn until 0720, then 252°T at 4.3 kn until 0735.

   Give the 0735 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  

5. At 1110 you fix your position 215°T, 0.8 nm from Gannet Rock daybeacon. You steer 339°T at 10.0 kn until 1120, then 172°T at 9.4 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  

6. At 1045 you fix your position 083°T, 3.6 nm from Westfield church spire. You steer 109°T at 8.2 kn until 1100, then 195°T at 4.1 kn until 1145.

   Give the 1145 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  

7. At 1215 you fix your position 083°T, 2.8 nm from Gannet Rock daybeacon. You steer 170°T at 4.3 kn until 1230, then 357°T at 6.2 kn until 1300.

   Give the 1300 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 1525 you fix your position 056°T, 1.7 nm from Heron Point Light. You steer 309°T at 6.5 kn until 1545, then 099°T at 4.6 kn until 1615.

   Give the 1615 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