Worksheet 624 · Skill 3

Dead reckoning

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1. At 0750 you fix your position 085°T, 2.4 nm from Westfield church spire. You steer 117°T at 5.8 kn until 0800, then 005°T at 5.3 kn until 0840.

   Give the 0840 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 1525 you fix your position 220°T, 1.7 nm from Tern Island tower. You steer 173°T at 4.6 kn until 1545, then 359°T at 4.1 kn until 1605.

   Give the 1605 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 0745 you fix your position 083°T, 1.6 nm from Tern Island tower. You steer 077°T at 7.2 kn until 0800, then 352°T at 7.5 kn until 0815.

   Give the 0815 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 1225 you fix your position 048°T, 1.5 nm from Tern Island tower. You steer 074°T at 5.0 kn until 1240, then 273°T at 6.6 kn until 1325.

   Give the 1325 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 0800 you fix your position 148°T, 1.4 nm from Gannet Rock daybeacon. You steer 284°T at 4.3 kn until 0840, then 052°T at 7.1 kn until 0920.

   Give the 0920 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  

6. At 0730 you fix your position 035°T, 4.3 nm from Gannet Rock daybeacon. You steer 240°T at 8.4 kn until 0750, then 135°T at 6.6 kn until 0830.

   Give the 0830 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

7. At 0925 you fix your position 083°T, 3.6 nm from Westfield church spire. You steer 013°T at 4.2 kn until 1010, then 179°T at 5.8 kn until 1020.

   Give the 1020 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 1300 you fix your position 274°T, 3.4 nm from Tern Island tower. You steer 229°T at 4.9 kn until 1325, then 084°T at 5.3 kn until 1335.

   Give the 1335 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