Worksheet 503 · Skill 3

Dead reckoning

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1. At 0835 you fix your position 092°T, 3.7 nm from Westfield church spire. You steer 061°T at 7.4 kn until 0855, then 234°T at 5.4 kn until 0915.

   Give the 0915 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 0805 you fix your position 047°T, 3.7 nm from Gannet Rock daybeacon. You steer 184°T at 6.5 kn until 0845, then 346°T at 5.8 kn until 0905.

   Give the 0905 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 1235 you fix your position 311°T, 1.4 nm from Gannet Rock daybeacon. You steer 246°T at 6.9 kn until 1305, then 067°T at 7.3 kn until 1345.

   Give the 1345 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 0955 you fix your position 045°T, 1.5 nm from Heron Point Light. You steer 022°T at 7.3 kn until 1010, then 340°T at 6.1 kn until 1020.

   Give the 1020 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  

5. At 0705 you fix your position 028°T, 3.0 nm from Heron Point Light. You steer 278°T at 5.0 kn until 0715, then 146°T at 7.1 kn until 0750.

   Give the 0750 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  

6. At 0940 you fix your position 033°T, 3.3 nm from Gannet Rock daybeacon. You steer 271°T at 9.8 kn until 0950, then 046°T at 9.4 kn until 1000.

   Give the 1000 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  

7. At 1400 you fix your position 225°T, 3.1 nm from Tern Island tower. You steer 081°T at 5.0 kn until 1415, then 229°T at 4.3 kn until 1435.

   Give the 1435 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 1020 you fix your position 240°T, 2.4 nm from Gannet Rock daybeacon. You steer 312°T at 6.4 kn until 1030, then 259°T at 6.2 kn until 1115.

   Give the 1115 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