Worksheet 621 · Skill 3

Dead reckoning

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1. At 1205 you fix your position 250°T, 2.8 nm from Gannet Rock daybeacon. You steer 338°T at 4.7 kn until 1240, then 262°T at 6.3 kn until 1320.

   Give the 1320 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  

2. At 0945 you fix your position 051°T, 3.2 nm from Westfield church spire. You steer 095°T at 4.5 kn until 0955, then 023°T at 4.1 kn until 1005.

   Give the 1005 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 1415 you fix your position 033°T, 2.3 nm from Gannet Rock daybeacon. You steer 160°T at 6.2 kn until 1430, then 353°T at 8.9 kn until 1440.

   Give the 1440 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  

4. At 0820 you fix your position 251°T, 2.5 nm from Gannet Rock daybeacon. You steer 237°T at 4.0 kn until 0850, then 312°T at 7.9 kn until 0905.

   Give the 0905 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 0820 you fix your position 354°T, 1.5 nm from Gannet Rock daybeacon. You steer 209°T at 7.3 kn until 0855, then 343°T at 4.8 kn until 0930.

   Give the 0930 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 1520 you fix your position 027°T, 2.3 nm from Westfield church spire. You steer 042°T at 4.8 kn until 1545, then 161°T at 9.4 kn until 1620.

   Give the 1620 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  

7. At 0900 you fix your position 053°T, 1.9 nm from Tern Island tower. You steer 173°T at 6.4 kn until 0920, then 353°T at 5.0 kn until 0950.

   Give the 0950 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 0930 you fix your position 068°T, 3.5 nm from Westfield church spire. You steer 184°T at 5.1 kn until 0950, then 049°T at 5.6 kn until 1010.

   Give the 1010 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