Worksheet 613 · Skill 3

Dead reckoning

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1. At 0955 you fix your position 270°T, 1.4 nm from Gannet Rock daybeacon. You steer 287°T at 7.0 kn until 1010, then 338°T at 5.4 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  

2. At 0905 you fix your position 027°T, 1.9 nm from Mill stack. You steer 266°T at 6.3 kn until 0930, then 095°T at 7.7 kn until 0950.

   Give the 0950 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

3. At 1120 you fix your position 031°T, 3.6 nm from Heron Point Light. You steer 187°T at 7.3 kn until 1135, then 292°T at 7.8 kn until 1145.

   Give the 1145 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 1455 you fix your position 262°T, 2.5 nm from Tern Island tower. You steer 021°T at 5.2 kn until 1505, then 195°T at 4.2 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  

5. At 0950 you fix your position 205°T, 1.3 nm from Gannet Rock daybeacon. You steer 307°T at 4.9 kn until 1035, then 008°T at 9.9 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  

6. At 0755 you fix your position 073°T, 1.5 nm from Heron Point Light. You steer 333°T at 6.9 kn until 0840, then 142°T at 8.8 kn until 0915.

   Give the 0915 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  

7. At 0930 you fix your position 353°T, 1.4 nm from Kittle water tank. You steer 340°T at 9.6 kn until 0955, then 142°T at 7.2 kn until 1010.

   Give the 1010 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 1110 you fix your position 222°T, 3.5 nm from Tern Island tower. You steer 239°T at 7.6 kn until 1130, then 097°T at 6.9 kn until 1140.

   Give the 1140 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