Worksheet 720 · Skill 3

Dead reckoning

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1. At 1210 you fix your position 104°T, 2.0 nm from Gannet Rock daybeacon. You steer 257°T at 9.3 kn until 1220, then 101°T at 4.3 kn until 1230.

   Give the 1230 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 1210 you fix your position 201°T, 1.7 nm from Gannet Rock daybeacon. You steer 276°T at 7.0 kn until 1230, then 318°T at 8.3 kn until 1255.

   Give the 1255 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 0805 you fix your position 021°T, 1.9 nm from Gannet Rock daybeacon. You steer 258°T at 7.6 kn until 0850, then 080°T at 9.4 kn until 0900.

   Give the 0900 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 1025 you fix your position 305°T, 2.3 nm from Tern Island tower. You steer 128°T at 4.1 kn until 1040, then 065°T at 6.9 kn until 1100.

   Give the 1100 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 0750 you fix your position 047°T, 3.7 nm from Tern Island tower. You steer 176°T at 9.0 kn until 0815, then 255°T at 8.3 kn until 0855.

   Give the 0855 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 1600 you fix your position 077°T, 1.2 nm from Westfield church spire. You steer 151°T at 9.0 kn until 1630, then 119°T at 4.3 kn until 1640.

   Give the 1640 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 1020 you fix your position 277°T, 2.2 nm from Tern Island tower. You steer 136°T at 8.4 kn until 1040, then 169°T at 5.8 kn until 1110.

   Give the 1110 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  

8. At 1455 you fix your position 039°T, 3.4 nm from Westfield church spire. You steer 152°T at 7.4 kn until 1505, then 106°T at 7.8 kn until 1520.

   Give the 1520 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