Worksheet 675 · Skill 3

Dead reckoning

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1. At 0905 you fix your position 047°T, 1.8 nm from Heron Point Light. You steer 008°T at 5.7 kn until 0945, then 078°T at 8.8 kn until 1010.

   Give the 1010 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 1515 you fix your position 015°T, 2.5 nm from Mill stack. You steer 298°T at 5.8 kn until 1550, then 077°T at 9.1 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  

3. At 1030 you fix your position 065°T, 1.9 nm from Heron Point Light. You steer 024°T at 4.9 kn until 1045, then 206°T at 5.2 kn until 1105.

   Give the 1105 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  

4. At 1210 you fix your position 088°T, 3.7 nm from Westfield church spire. You steer 103°T at 8.2 kn until 1230, then 208°T at 8.1 kn until 1245.

   Give the 1245 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 1455 you fix your position 337°T, 1.5 nm from Tern Island tower. You steer 106°T at 5.4 kn until 1520, then 179°T at 4.3 kn until 1555.

   Give the 1555 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 0755 you fix your position 011°T, 2.1 nm from Tern Island tower. You steer 097°T at 8.9 kn until 0815, then 175°T at 6.3 kn until 0900.

   Give the 0900 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  

7. At 1130 you fix your position 030°T, 4.1 nm from Westfield church spire. You steer 137°T at 10.0 kn until 1210, then 168°T at 5.1 kn until 1230.

   Give the 1230 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  

8. At 0755 you fix your position 248°T, 1.0 nm from Gannet Rock daybeacon. You steer 005°T at 5.6 kn until 0805, then 251°T at 5.7 kn until 0850.

   Give the 0850 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