Worksheet 683 · Skill 3

Dead reckoning

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1. At 1525 you fix your position 068°T, 3.2 nm from Gannet Rock daybeacon. You steer 003°T at 6.2 kn until 1535, then 186°T at 7.0 kn until 1555.

   Give the 1555 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 0845 you fix your position 233°T, 3.2 nm from Tern Island tower. You steer 259°T at 4.1 kn until 0915, then 036°T at 8.8 kn until 0945.

   Give the 0945 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 1430 you fix your position 002°T, 1.5 nm from Mill stack. You steer 010°T at 4.8 kn until 1445, then 084°T at 6.4 kn until 1525.

   Give the 1525 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 1255 you fix your position 065°T, 2.7 nm from Heron Point Light. You steer 017°T at 4.0 kn until 1310, then 141°T at 10.0 kn until 1320.

   Give the 1320 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 1240 you fix your position 033°T, 4.1 nm from Gannet Rock daybeacon. You steer 198°T at 7.4 kn until 1300, then 320°T at 5.0 kn until 1320.

   Give the 1320 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 1545 you fix your position 017°T, 3.4 nm from Westfield church spire. You steer 092°T at 7.4 kn until 1610, then 261°T at 8.1 kn until 1640.

   Give the 1640 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  

7. At 1320 you fix your position 266°T, 2.0 nm from Tern Island tower. You steer 148°T at 7.8 kn until 1340, then 270°T at 9.1 kn until 1420.

   Give the 1420 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  

8. At 1420 you fix your position 289°T, 2.9 nm from Tern Island tower. You steer 133°T at 6.9 kn until 1430, then 173°T at 5.7 kn until 1440.

   Give the 1440 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