Worksheet 457 · Skill 3

Dead reckoning

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1. At 1455 you fix your position 237°T, 2.2 nm from Tern Island tower. You steer 266°T at 8.2 kn until 1505, then 096°T at 5.5 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  

2. At 1220 you fix your position 081°T, 2.1 nm from Gannet Rock daybeacon. You steer 130°T at 4.9 kn until 1235, then 180°T at 4.3 kn until 1245.

   Give the 1245 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  

3. At 1300 you fix your position 042°T, 2.8 nm from Westfield church spire. You steer 086°T at 7.7 kn until 1320, then 264°T at 4.2 kn until 1340.

   Give the 1340 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  

4. At 0805 you fix your position 119°T, 1.5 nm from Gannet Rock daybeacon. You steer 349°T at 6.6 kn until 0820, then 195°T at 7.7 kn until 0840.

   Give the 0840 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 0955 you fix your position 029°T, 2.9 nm from Heron Point Light. You steer 251°T at 6.7 kn until 1010, then 348°T at 5.0 kn until 1025.

   Give the 1025 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  

6. At 1325 you fix your position 128°T, 1.0 nm from Westfield church spire. You steer 121°T at 7.0 kn until 1335, then 342°T at 8.3 kn until 1350.

   Give the 1350 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 0940 you fix your position 144°T, 3.2 nm from Westfield church spire. You steer 074°T at 7.1 kn until 0950, then 297°T at 8.1 kn until 1005.

   Give the 1005 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 1105 you fix your position 260°T, 3.3 nm from Tern Island tower. You steer 189°T at 5.2 kn until 1115, then 226°T at 9.4 kn until 1130.

   Give the 1130 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