Worksheet 789 · Skill 3

Dead reckoning

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1. At 0815 you fix your position 076°T, 2.6 nm from Westfield church spire. You steer 119°T at 6.3 kn until 0850, then 222°T at 6.9 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  

2. At 1520 you fix your position 041°T, 1.3 nm from Gannet Rock daybeacon. You steer 262°T at 9.1 kn until 1555, then 133°T at 8.4 kn until 1605.

   Give the 1605 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 0755 you fix your position 249°T, 1.8 nm from Gannet Rock daybeacon. You steer 329°T at 4.8 kn until 0835, then 199°T at 4.0 kn until 0905.

   Give the 0905 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 1420 you fix your position 031°T, 2.9 nm from Westfield church spire. You steer 046°T at 8.7 kn until 1430, then 152°T at 7.0 kn until 1440.

   Give the 1440 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 1020 you fix your position 356°T, 2.3 nm from Mill stack. You steer 020°T at 9.2 kn until 1030, then 234°T at 5.9 kn until 1040.

   Give the 1040 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  

6. At 1025 you fix your position 348°T, 1.9 nm from Mill stack. You steer 084°T at 4.2 kn until 1055, then 017°T at 4.7 kn until 1110.

   Give the 1110 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  

7. At 1025 you fix your position 265°T, 0.9 nm from Gannet Rock daybeacon. You steer 260°T at 6.7 kn until 1110, then 061°T at 6.2 kn until 1140.

   Give the 1140 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 1415 you fix your position 225°T, 2.7 nm from Tern Island tower. You steer 199°T at 6.0 kn until 1425, then 048°T at 9.7 kn until 1440.

   Give the 1440 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