Worksheet 660 · Skill 3

Dead reckoning

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1. At 1435 you fix your position 060°T, 4.4 nm from Tern Island tower. You steer 204°T at 8.3 kn until 1455, then 040°T at 4.6 kn until 1530.

   Give the 1530 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 0905 you fix your position 228°T, 3.2 nm from Tern Island tower. You steer 309°T at 8.3 kn until 0925, then 122°T at 6.8 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 1315 you fix your position 015°T, 2.4 nm from Gannet Rock daybeacon. You steer 071°T at 8.4 kn until 1325, then 199°T at 5.1 kn until 1350.

   Give the 1350 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 1105 you fix your position 046°T, 3.1 nm from Gannet Rock daybeacon. You steer 223°T at 7.4 kn until 1120, then 323°T at 6.7 kn until 1140.

   Give the 1140 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 1045 you fix your position 079°T, 3.6 nm from Westfield church spire. You steer 064°T at 4.3 kn until 1105, then 145°T at 6.7 kn until 1140.

   Give the 1140 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 0915 you fix your position 024°T, 2.6 nm from Heron Point Light. You steer 113°T at 5.5 kn until 0945, then 327°T at 4.2 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  

7. At 1115 you fix your position 130°T, 1.4 nm from Tern Island tower. You steer 073°T at 5.2 kn until 1155, then 245°T at 7.7 kn until 1225.

   Give the 1225 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  

8. At 0710 you fix your position 023°T, 1.9 nm from Heron Point Light. You steer 081°T at 4.5 kn until 0725, then 031°T at 6.7 kn until 0735.

   Give the 0735 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