Worksheet 751 · Skill 3

Dead reckoning

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1. At 0945 you fix your position 123°T, 1.9 nm from Westfield church spire. You steer 010°T at 6.5 kn until 1020, then 288°T at 4.6 kn until 1050.

   Give the 1050 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 1210 you fix your position 293°T, 3.1 nm from Tern Island tower. You steer 248°T at 8.5 kn until 1225, then 057°T at 4.0 kn until 1300.

   Give the 1300 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 0750 you fix your position 171°T, 1.6 nm from Gannet Rock daybeacon. You steer 255°T at 5.5 kn until 0815, then 057°T at 8.4 kn until 0830.

   Give the 0830 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  

4. At 0800 you fix your position 017°T, 2.4 nm from Mill stack. You steer 001°T at 5.8 kn until 0820, then 234°T at 4.6 kn until 0845.

   Give the 0845 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  

5. At 1340 you fix your position 073°T, 2.0 nm from Gannet Rock daybeacon. You steer 308°T at 6.1 kn until 1400, then 139°T at 6.1 kn until 1435.

   Give the 1435 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 1600 you fix your position 245°T, 2.4 nm from Gannet Rock daybeacon. You steer 100°T at 8.4 kn until 1620, then 255°T at 5.4 kn until 1700.

   Give the 1700 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  

7. At 1250 you fix your position 064°T, 3.0 nm from Heron Point Light. You steer 218°T at 8.6 kn until 1300, then 155°T at 4.0 kn until 1315.

   Give the 1315 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  

8. At 0740 you fix your position 259°T, 2.0 nm from Gannet Rock daybeacon. You steer 226°T at 4.4 kn until 0810, then 331°T at 6.5 kn until 0820.

   Give the 0820 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