Worksheet 51 · Skill 3

Dead reckoning

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1. At 0800 you fix your position 239°T, 3.2 nm from Tern Island tower. You steer 348°T at 6.4 kn until 0840, then 111°T at 4.1 kn until 0855.

   Give the 0855 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 1055 you fix your position 068°T, 1.0 nm from Westfield church spire. You steer 062°T at 7.5 kn until 1115, then 311°T at 6.6 kn until 1135.

   Give the 1135 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  

3. At 1145 you fix your position 005°T, 2.9 nm from Westfield church spire. You steer 100°T at 9.3 kn until 1215, then 230°T at 6.5 kn until 1245.

   Give the 1245 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 0740 you fix your position 223°T, 2.1 nm from Gannet Rock daybeacon. You steer 235°T at 7.8 kn until 0755, then 080°T at 5.7 kn until 0825.

   Give the 0825 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

5. At 0930 you fix your position 229°T, 2.9 nm from Tern Island tower. You steer 035°T at 6.6 kn until 0945, then 201°T at 4.7 kn until 1020.

   Give the 1020 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  

6. At 1415 you fix your position 062°T, 3.8 nm from Westfield church spire. You steer 168°T at 5.3 kn until 1425, then 111°T at 7.7 kn until 1450.

   Give the 1450 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 0840 you fix your position 033°T, 1.9 nm from Kittle water tank. You steer 247°T at 5.1 kn until 0850, then 297°T at 8.0 kn until 0930.

   Give the 0930 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 1145 you fix your position 060°T, 2.9 nm from Westfield church spire. You steer 182°T at 9.8 kn until 1210, then 103°T at 8.7 kn until 1240.

   Give the 1240 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