Worksheet 418 · Skill 3

Dead reckoning

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1. At 1125 you fix your position 027°T, 3.1 nm from Heron Point Light. You steer 047°T at 7.4 kn until 1135, then 149°T at 7.8 kn until 1145.

   Give the 1145 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 1120 you fix your position 285°T, 2.5 nm from Tern Island tower. You steer 028°T at 4.0 kn until 1135, then 163°T at 8.1 kn until 1145.

   Give the 1145 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 1140 you fix your position 247°T, 1.6 nm from Tern Island tower. You steer 334°T at 9.0 kn until 1155, then 273°T at 7.2 kn until 1215.

   Give the 1215 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 1125 you fix your position 055°T, 2.7 nm from Heron Point Light. You steer 043°T at 8.3 kn until 1135, then 238°T at 5.1 kn until 1215.

   Give the 1215 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 0930 you fix your position 063°T, 3.1 nm from Westfield church spire. You steer 314°T at 5.6 kn until 0940, then 108°T at 9.6 kn until 0955.

   Give the 0955 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 1300 you fix your position 254°T, 0.9 nm from Gannet Rock daybeacon. You steer 033°T at 5.9 kn until 1345, then 289°T at 7.0 kn until 1415.

   Give the 1415 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 1325 you fix your position 203°T, 1.6 nm from Tern Island tower. You steer 088°T at 5.4 kn until 1350, then 008°T at 5.3 kn until 1435.

   Give the 1435 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 0845 you fix your position 005°T, 2.9 nm from Mill stack. You steer 003°T at 8.1 kn until 0900, then 248°T at 6.9 kn until 0910.

   Give the 0910 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