Worksheet 733 · Skill 3

Dead reckoning

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1. At 1000 you fix your position 353°T, 1.8 nm from Gannet Rock daybeacon. You steer 130°T at 4.9 kn until 1030, then 318°T at 6.2 kn until 1055.

   Give the 1055 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 0850 you fix your position 027°T, 1.0 nm from Westfield church spire. You steer 107°T at 8.7 kn until 0910, then 140°T at 5.3 kn until 0930.

   Give the 0930 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  

3. At 0715 you fix your position 035°T, 2.4 nm from Heron Point Light. You steer 314°T at 4.6 kn until 0745, then 013°T at 9.1 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  

4. At 1405 you fix your position 011°T, 1.7 nm from Mill stack. You steer 018°T at 9.6 kn until 1415, then 231°T at 7.6 kn until 1430.

   Give the 1430 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 1300 you fix your position 134°T, 1.4 nm from Tern Island tower. You steer 059°T at 5.1 kn until 1345, then 271°T at 5.6 kn until 1425.

   Give the 1425 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 0825 you fix your position 220°T, 2.6 nm from Tern Island tower. You steer 240°T at 9.3 kn until 0850, then 009°T at 9.4 kn until 0905.

   Give the 0905 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  

7. At 1315 you fix your position 280°T, 3.0 nm from Tern Island tower. You steer 078°T at 7.1 kn until 1350, then 138°T at 5.2 kn until 1405.

   Give the 1405 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 1340 you fix your position 241°T, 3.3 nm from Tern Island tower. You steer 071°T at 8.7 kn until 1350, then 292°T at 5.9 kn until 1400.

   Give the 1400 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