Worksheet 745 · Skill 3

Dead reckoning

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1. At 1300 you fix your position 109°T, 1.8 nm from Westfield church spire. You steer 077°T at 5.3 kn until 1315, then 047°T at 6.7 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  

2. At 0755 you fix your position 043°T, 2.9 nm from Gannet Rock daybeacon. You steer 314°T at 9.4 kn until 0810, then 240°T at 6.5 kn until 0820.

   Give the 0820 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 0955 you fix your position 299°T, 1.3 nm from Tern Island tower. You steer 224°T at 5.5 kn until 1020, then 289°T at 8.9 kn until 1045.

   Give the 1045 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 1015 you fix your position 053°T, 3.2 nm from Westfield church spire. You steer 148°T at 5.0 kn until 1040, then 047°T at 8.2 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  

5. At 1145 you fix your position 203°T, 1.6 nm from Tern Island tower. You steer 174°T at 5.9 kn until 1215, then 036°T at 7.9 kn until 1300.

   Give the 1300 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 1440 you fix your position 059°T, 3.2 nm from Heron Point Light. You steer 321°T at 5.4 kn until 1525, then 128°T at 5.9 kn until 1550.

   Give the 1550 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 0750 you fix your position 058°T, 3.4 nm from Heron Point Light. You steer 215°T at 4.3 kn until 0800, then 048°T at 5.4 kn until 0825.

   Give the 0825 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 1300 you fix your position 093°T, 2.1 nm from Tern Island tower. You steer 004°T at 5.4 kn until 1320, then 185°T at 4.5 kn until 1405.

   Give the 1405 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