Worksheet 731 · Skill 3

Dead reckoning

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1. At 1355 you fix your position 042°T, 2.8 nm from Heron Point Light. You steer 184°T at 5.9 kn until 1410, then 352°T at 7.5 kn until 1455.

   Give the 1455 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 1335 you fix your position 019°T, 2.3 nm from Heron Point Light. You steer 011°T at 6.0 kn until 1350, then 130°T at 6.2 kn until 1435.

   Give the 1435 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  

3. At 1325 you fix your position 131°T, 1.7 nm from Westfield church spire. You steer 019°T at 7.2 kn until 1340, then 147°T at 6.5 kn until 1350.

   Give the 1350 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 1525 you fix your position 347°T, 1.1 nm from Kittle water tank. You steer 073°T at 4.1 kn until 1555, then 318°T at 8.7 kn until 1630.

   Give the 1630 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 0700 you fix your position 330°T, 2.8 nm from Tern Island tower. You steer 242°T at 7.7 kn until 0740, then 331°T at 8.4 kn until 0755.

   Give the 0755 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  

6. At 1055 you fix your position 230°T, 2.7 nm from Tern Island tower. You steer 353°T at 6.2 kn until 1130, then 176°T at 8.6 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  

7. At 0910 you fix your position 293°T, 1.5 nm from Gannet Rock daybeacon. You steer 093°T at 7.3 kn until 0940, then 335°T at 6.0 kn until 1000.

   Give the 1000 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  

8. At 0855 you fix your position 027°T, 2.5 nm from Mill stack. You steer 045°T at 6.9 kn until 0920, then 210°T at 6.0 kn until 0955.

   Give the 0955 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