Worksheet 483 · Skill 3

Dead reckoning

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1. At 1130 you fix your position 167°T, 1.3 nm from Tern Island tower. You steer 244°T at 4.5 kn until 1205, then 106°T at 6.2 kn until 1240.

   Give the 1240 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  

2. At 0735 you fix your position 236°T, 2.8 nm from Tern Island tower. You steer 320°T at 7.2 kn until 0800, then 176°T at 5.9 kn until 0845.

   Give the 0845 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 1015 you fix your position 016°T, 1.9 nm from Tern Island tower. You steer 098°T at 8.8 kn until 1025, then 286°T at 9.2 kn until 1035.

   Give the 1035 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  

4. At 1315 you fix your position 110°T, 1.7 nm from Tern Island tower. You steer 224°T at 6.0 kn until 1400, then 058°T at 8.2 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  

5. At 0835 you fix your position 216°T, 2.4 nm from Tern Island tower. You steer 271°T at 6.9 kn until 0855, then 307°T at 6.5 kn until 0935.

   Give the 0935 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 0720 you fix your position 358°T, 1.7 nm from Gannet Rock daybeacon. You steer 250°T at 9.8 kn until 0805, then 122°T at 9.5 kn until 0820.

   Give the 0820 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  

7. At 0810 you fix your position 036°T, 1.7 nm from Westfield church spire. You steer 334°T at 4.5 kn until 0830, then 123°T at 4.7 kn until 0850.

   Give the 0850 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 1540 you fix your position 322°T, 1.7 nm from Tern Island tower. You steer 290°T at 9.6 kn until 1550, then 149°T at 6.3 kn until 1605.

   Give the 1605 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