Worksheet 339 · Skill 3

Dead reckoning

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1. At 1015 you fix your position 092°T, 3.6 nm from Westfield church spire. You steer 024°T at 9.4 kn until 1035, then 309°T at 6.9 kn until 1045.

   Give the 1045 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 0820 you fix your position 089°T, 2.1 nm from Tern Island tower. You steer 088°T at 8.4 kn until 0830, then 235°T at 5.6 kn until 0910.

   Give the 0910 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  

3. At 0845 you fix your position 075°T, 2.5 nm from Westfield church spire. You steer 084°T at 4.0 kn until 0925, then 358°T at 4.0 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  

4. At 1500 you fix your position 356°T, 2.1 nm from Mill stack. You steer 020°T at 5.0 kn until 1535, then 174°T at 6.7 kn until 1600.

   Give the 1600 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

5. At 1430 you fix your position 031°T, 2.5 nm from Westfield church spire. You steer 165°T at 9.8 kn until 1500, then 030°T at 5.1 kn until 1520.

   Give the 1520 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 1540 you fix your position 034°T, 2.1 nm from Westfield church spire. You steer 141°T at 9.8 kn until 1610, then 236°T at 4.8 kn until 1630.

   Give the 1630 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 0820 you fix your position 040°T, 2.0 nm from Kittle water tank. You steer 346°T at 4.7 kn until 0850, then 225°T at 8.2 kn until 0925.

   Give the 0925 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

8. At 1050 you fix your position 011°T, 2.1 nm from Mill stack. You steer 306°T at 8.8 kn until 1110, then 027°T at 8.1 kn until 1140.

   Give the 1140 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