Worksheet 581 · Skill 3

Dead reckoning

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1. At 0730 you fix your position 191°T, 2.0 nm from Tern Island tower. You steer 199°T at 6.1 kn until 0745, then 023°T at 5.6 kn until 0800.

   Give the 0800 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 1510 you fix your position 024°T, 1.7 nm from Tern Island tower. You steer 245°T at 8.1 kn until 1545, then 017°T at 6.7 kn until 1610.

   Give the 1610 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 0850 you fix your position 229°T, 2.8 nm from Tern Island tower. You steer 078°T at 5.0 kn until 0925, then 040°T at 7.6 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  

4. At 0855 you fix your position 063°T, 2.9 nm from Westfield church spire. You steer 211°T at 4.8 kn until 0925, then 015°T at 5.1 kn until 0945.

   Give the 0945 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  

5. At 0710 you fix your position 293°T, 4.1 nm from Tern Island tower. You steer 183°T at 9.8 kn until 0740, then 052°T at 5.6 kn until 0815.

   Give the 0815 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 0800 you fix your position 027°T, 2.0 nm from Tern Island tower. You steer 260°T at 8.3 kn until 0840, then 141°T at 9.7 kn until 0855.

   Give the 0855 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 1300 you fix your position 029°T, 1.6 nm from Tern Island tower. You steer 097°T at 4.2 kn until 1335, then 064°T at 4.7 kn until 1355.

   Give the 1355 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 0835 you fix your position 060°T, 2.4 nm from Heron Point Light. You steer 351°T at 8.7 kn until 0910, then 194°T at 8.5 kn until 0940.

   Give the 0940 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