Worksheet 634 · Skill 3

Dead reckoning

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1. At 1415 you fix your position 299°T, 3.2 nm from Tern Island tower. You steer 248°T at 5.2 kn until 1435, then 085°T at 9.9 kn until 1455.

   Give the 1455 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 1345 you fix your position 273°T, 1.7 nm from Tern Island tower. You steer 180°T at 4.1 kn until 1425, then 073°T at 5.6 kn until 1440.

   Give the 1440 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 0945 you fix your position 062°T, 1.8 nm from Gannet Rock daybeacon. You steer 202°T at 6.6 kn until 0955, then 048°T at 6.3 kn until 1020.

   Give the 1020 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  

4. At 1205 you fix your position 042°T, 3.5 nm from Westfield church spire. You steer 052°T at 9.3 kn until 1215, then 166°T at 4.2 kn until 1235.

   Give the 1235 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 1005 you fix your position 030°T, 4.0 nm from Westfield church spire. You steer 195°T at 5.0 kn until 1025, then 159°T at 8.1 kn until 1100.

   Give the 1100 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 1005 you fix your position 057°T, 4.5 nm from Tern Island tower. You steer 263°T at 5.6 kn until 1030, then 139°T at 5.7 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  

7. At 0815 you fix your position 042°T, 2.0 nm from Westfield church spire. You steer 196°T at 5.4 kn until 0825, then 039°T at 8.4 kn until 0840.

   Give the 0840 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  

8. At 1040 you fix your position 290°T, 4.1 nm from Tern Island tower. You steer 148°T at 8.5 kn until 1100, then 013°T at 7.2 kn until 1115.

   Give the 1115 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