Worksheet 460 · Skill 3

Dead reckoning

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1. At 1045 you fix your position 215°T, 1.5 nm from Tern Island tower. You steer 317°T at 8.5 kn until 1120, then 205°T at 5.6 kn until 1145.

   Give the 1145 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 0840 you fix your position 356°T, 0.9 nm from Kittle water tank. You steer 349°T at 8.7 kn until 0925, then 254°T at 7.2 kn until 1000.

   Give the 1000 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 0825 you fix your position 023°T, 1.6 nm from Westfield church spire. You steer 122°T at 5.7 kn until 0855, then 237°T at 5.9 kn until 0915.

   Give the 0915 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 0950 you fix your position 041°T, 2.5 nm from Westfield church spire. You steer 041°T at 7.7 kn until 1000, then 081°T at 5.6 kn until 1025.

   Give the 1025 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  

5. At 1310 you fix your position 051°T, 2.0 nm from Westfield church spire. You steer 113°T at 8.9 kn until 1330, then 172°T at 4.6 kn until 1350.

   Give the 1350 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 1130 you fix your position 232°T, 2.2 nm from Tern Island tower. You steer 261°T at 8.8 kn until 1145, then 029°T at 4.0 kn until 1220.

   Give the 1220 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  

7. At 1005 you fix your position 084°T, 2.3 nm from Tern Island tower. You steer 218°T at 5.1 kn until 1050, then 315°T at 8.5 kn until 1100.

   Give the 1100 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 1000 you fix your position 039°T, 3.3 nm from Westfield church spire. You steer 177°T at 5.2 kn until 1035, then 226°T at 7.1 kn until 1050.

   Give the 1050 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