Worksheet 759 · Skill 3

Dead reckoning

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1. At 0850 you fix your position 049°T, 2.0 nm from Kittle water tank. You steer 312°T at 8.1 kn until 0905, then 345°T at 6.8 kn until 0950.

   Give the 0950 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 1035 you fix your position 073°T, 2.7 nm from Tern Island tower. You steer 140°T at 5.9 kn until 1105, then 296°T at 5.3 kn until 1115.

   Give the 1115 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  

3. At 1250 you fix your position 321°T, 1.7 nm from Tern Island tower. You steer 256°T at 9.4 kn until 1300, then 211°T at 8.4 kn until 1335.

   Give the 1335 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  

4. At 0930 you fix your position 261°T, 2.8 nm from Tern Island tower. You steer 201°T at 4.6 kn until 0950, then 040°T at 4.4 kn until 1000.

   Give the 1000 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 0705 you fix your position 168°T, 1.3 nm from Gannet Rock daybeacon. You steer 219°T at 5.7 kn until 0720, then 004°T at 7.1 kn until 0805.

   Give the 0805 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 1320 you fix your position 251°T, 3.2 nm from Tern Island tower. You steer 292°T at 8.8 kn until 1345, then 158°T at 4.5 kn until 1405.

   Give the 1405 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 1010 you fix your position 226°T, 3.4 nm from Tern Island tower. You steer 308°T at 7.7 kn until 1025, then 119°T at 8.6 kn until 1045.

   Give the 1045 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 1220 you fix your position 201°T, 2.3 nm from Tern Island tower. You steer 169°T at 6.4 kn until 1240, then 261°T at 7.5 kn until 1305.

   Give the 1305 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