Worksheet 682 · Skill 3

Dead reckoning

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1. At 1400 you fix your position 279°T, 3.1 nm from Tern Island tower. You steer 221°T at 5.8 kn until 1410, then 085°T at 4.6 kn until 1435.

   Give the 1435 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 1535 you fix your position 240°T, 3.2 nm from Tern Island tower. You steer 347°T at 8.1 kn until 1600, then 094°T at 4.4 kn until 1640.

   Give the 1640 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 0935 you fix your position 079°T, 2.2 nm from Gannet Rock daybeacon. You steer 335°T at 6.7 kn until 1010, then 174°T at 4.6 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  

4. At 0805 you fix your position 287°T, 2.3 nm from Tern Island tower. You steer 191°T at 7.8 kn until 0825, then 146°T at 4.3 kn until 0910.

   Give the 0910 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 1320 you fix your position 054°T, 2.4 nm from Westfield church spire. You steer 356°T at 6.6 kn until 1330, then 092°T at 9.6 kn until 1350.

   Give the 1350 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 0840 you fix your position 026°T, 2.9 nm from Heron Point Light. You steer 204°T at 5.1 kn until 0900, then 040°T at 9.4 kn until 0915.

   Give the 0915 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 1010 you fix your position 037°T, 4.1 nm from Westfield church spire. You steer 138°T at 7.5 kn until 1050, then 301°T at 7.7 kn until 1100.

   Give the 1100 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 1350 you fix your position 095°T, 1.8 nm from Westfield church spire. You steer 062°T at 7.9 kn until 1425, then 318°T at 7.2 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