Worksheet 182 · Skill 3

Dead reckoning

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1. At 1015 you fix your position 059°T, 2.0 nm from Heron Point Light. You steer 083°T at 9.3 kn until 1035, then 354°T at 7.2 kn until 1050.

   Give the 1050 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 0925 you fix your position 033°T, 3.7 nm from Gannet Rock daybeacon. You steer 293°T at 6.7 kn until 1010, then 239°T at 4.5 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  

3. At 1510 you fix your position 024°T, 1.9 nm from Heron Point Light. You steer 018°T at 5.7 kn until 1555, then 325°T at 7.2 kn until 1605.

   Give the 1605 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 1230 you fix your position 101°T, 1.7 nm from Westfield church spire. You steer 110°T at 8.4 kn until 1305, then 303°T at 8.2 kn until 1315.

   Give the 1315 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 1220 you fix your position 354°T, 1.9 nm from Mill stack. You steer 165°T at 6.9 kn until 1230, then 073°T at 5.1 kn until 1315.

   Give the 1315 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  

6. At 0725 you fix your position 005°T, 2.9 nm from Mill stack. You steer 016°T at 8.9 kn until 0735, then 056°T at 7.7 kn until 0745.

   Give the 0745 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 0805 you fix your position 229°T, 2.4 nm from Tern Island tower. You steer 309°T at 4.7 kn until 0820, then 255°T at 8.7 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  

8. At 0805 you fix your position 054°T, 1.6 nm from Westfield church spire. You steer 063°T at 5.6 kn until 0820, then 240°T at 5.8 kn until 0830.

   Give the 0830 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