Worksheet 691 · Skill 3

Dead reckoning

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1. At 1120 you fix your position 248°T, 2.0 nm from Gannet Rock daybeacon. You steer 352°T at 5.2 kn until 1140, then 311°T at 8.6 kn until 1150.

   Give the 1150 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 1320 you fix your position 031°T, 2.7 nm from Tern Island tower. You steer 129°T at 6.4 kn until 1400, then 249°T at 5.3 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 1445 you fix your position 002°T, 2.7 nm from Mill stack. You steer 326°T at 7.3 kn until 1520, then 048°T at 4.4 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  

4. At 1600 you fix your position 256°T, 1.4 nm from Gannet Rock daybeacon. You steer 269°T at 5.9 kn until 1640, then 213°T at 5.2 kn until 1650.

   Give the 1650 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  

5. At 1210 you fix your position 010°T, 1.9 nm from Westfield church spire. You steer 103°T at 4.8 kn until 1235, then 338°T at 4.5 kn until 1255.

   Give the 1255 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 1035 you fix your position 083°T, 1.7 nm from Tern Island tower. You steer 150°T at 4.9 kn until 1100, then 244°T at 6.6 kn until 1130.

   Give the 1130 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 0705 you fix your position 026°T, 1.9 nm from Gannet Rock daybeacon. You steer 221°T at 4.4 kn until 0735, then 017°T at 8.3 kn until 0805.

   Give the 0805 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 1020 you fix your position 047°T, 3.1 nm from Gannet Rock daybeacon. You steer 211°T at 8.1 kn until 1045, then 033°T at 9.5 kn until 1055.

   Give the 1055 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