Worksheet 249 · Skill 3

Dead reckoning

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1. At 0705 you fix your position 221°T, 2.8 nm from Tern Island tower. You steer 117°T at 5.9 kn until 0725, then 205°T at 5.6 kn until 0740.

   Give the 0740 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  

2. At 1445 you fix your position 243°T, 2.2 nm from Gannet Rock daybeacon. You steer 140°T at 8.1 kn until 1500, then 004°T at 5.3 kn until 1535.

   Give the 1535 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 1055 you fix your position 265°T, 1.2 nm from Gannet Rock daybeacon. You steer 126°T at 5.5 kn until 1105, then 094°T at 5.3 kn until 1115.

   Give the 1115 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  

4. At 0945 you fix your position 033°T, 2.7 nm from Heron Point Light. You steer 043°T at 4.5 kn until 1020, then 117°T at 6.6 kn until 1045.

   Give the 1045 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 1425 you fix your position 092°T, 3.6 nm from Westfield church spire. You steer 214°T at 9.9 kn until 1440, then 318°T at 4.8 kn until 1500.

   Give the 1500 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 1425 you fix your position 240°T, 2.1 nm from Tern Island tower. You steer 282°T at 9.9 kn until 1450, then 160°T at 8.0 kn until 1510.

   Give the 1510 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  

7. At 1155 you fix your position 265°T, 2.5 nm from Gannet Rock daybeacon. You steer 230°T at 6.7 kn until 1210, then 121°T at 6.5 kn until 1225.

   Give the 1225 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 1140 you fix your position 352°T, 1.1 nm from Gannet Rock daybeacon. You steer 220°T at 7.0 kn until 1200, then 259°T at 8.1 kn until 1230.

   Give the 1230 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