Worksheet 496 · Skill 3

Dead reckoning

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1. At 0750 you fix your position 273°T, 1.8 nm from Tern Island tower. You steer 163°T at 5.1 kn until 0805, then 290°T at 6.8 kn until 0845.

   Give the 0845 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 1505 you fix your position 063°T, 1.4 nm from Westfield church spire. You steer 060°T at 6.8 kn until 1550, then 140°T at 6.5 kn until 1600.

   Give the 1600 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 1220 you fix your position 082°T, 2.5 nm from Tern Island tower. You steer 163°T at 6.5 kn until 1245, then 198°T at 9.7 kn until 1300.

   Give the 1300 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  

4. At 1250 you fix your position 007°T, 3.5 nm from Westfield church spire. You steer 136°T at 8.9 kn until 1300, then 280°T at 6.3 kn until 1310.

   Give the 1310 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  

5. At 0705 you fix your position 290°T, 3.8 nm from Tern Island tower. You steer 042°T at 4.9 kn until 0725, then 254°T at 8.5 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  

6. At 1015 you fix your position 264°T, 2.9 nm from Gannet Rock daybeacon. You steer 099°T at 5.3 kn until 1030, then 046°T at 7.6 kn until 1040.

   Give the 1040 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 1500 you fix your position 022°T, 2.2 nm from Heron Point Light. You steer 007°T at 9.9 kn until 1520, then 063°T at 4.3 kn until 1540.

   Give the 1540 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 1455 you fix your position 032°T, 3.8 nm from Westfield church spire. You steer 126°T at 6.8 kn until 1535, then 259°T at 5.1 kn until 1620.

   Give the 1620 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