Worksheet 782 · Skill 3

Dead reckoning

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1. At 1530 you fix your position 295°T, 4.3 nm from Tern Island tower. You steer 231°T at 4.1 kn until 1550, then 019°T at 5.0 kn until 1610.

   Give the 1610 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  

2. At 0720 you fix your position 146°T, 1.5 nm from Tern Island tower. You steer 254°T at 5.8 kn until 0740, then 119°T at 7.2 kn until 0820.

   Give the 0820 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  

3. At 1405 you fix your position 077°T, 2.9 nm from Tern Island tower. You steer 085°T at 8.3 kn until 1415, then 325°T at 5.2 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  

4. At 0830 you fix your position 229°T, 2.5 nm from Gannet Rock daybeacon. You steer 255°T at 5.4 kn until 0900, then 319°T at 4.3 kn until 0940.

   Give the 0940 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  

5. At 1530 you fix your position 250°T, 2.7 nm from Tern Island tower. You steer 150°T at 9.8 kn until 1540, then 031°T at 4.8 kn until 1555.

   Give the 1555 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 0750 you fix your position 077°T, 2.1 nm from Westfield church spire. You steer 053°T at 7.4 kn until 0815, then 225°T at 5.6 kn until 0855.

   Give the 0855 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 1325 you fix your position 155°T, 2.6 nm from Tern Island tower. You steer 012°T at 9.5 kn until 1345, then 328°T at 4.4 kn until 1400.

   Give the 1400 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 0800 you fix your position 047°T, 1.7 nm from Heron Point Light. You steer 032°T at 5.7 kn until 0825, then 336°T at 4.1 kn until 0845.

   Give the 0845 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