Worksheet 347 · Skill 3

Dead reckoning

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1. At 1230 you fix your position 031°T, 2.9 nm from Gannet Rock daybeacon. You steer 229°T at 5.3 kn until 1315, then 044°T at 5.5 kn until 1330.

   Give the 1330 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  

2. At 1005 you fix your position 342°T, 1.1 nm from Gannet Rock daybeacon. You steer 050°T at 5.5 kn until 1035, then 165°T at 4.0 kn until 1105.

   Give the 1105 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  

3. At 0820 you fix your position 079°T, 2.7 nm from Gannet Rock daybeacon. You steer 338°T at 5.2 kn until 0835, then 228°T at 4.1 kn until 0845.

   Give the 0845 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 1050 you fix your position 359°T, 2.1 nm from Tern Island tower. You steer 258°T at 6.6 kn until 1125, then 186°T at 8.2 kn until 1140.

   Give the 1140 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 0945 you fix your position 003°T, 2.4 nm from Mill stack. You steer 025°T at 9.6 kn until 0955, then 064°T at 5.3 kn until 1020.

   Give the 1020 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  

6. At 1040 you fix your position 009°T, 2.3 nm from Heron Point Light. You steer 083°T at 7.4 kn until 1050, then 010°T at 5.8 kn until 1105.

   Give the 1105 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 1415 you fix your position 256°T, 1.5 nm from Tern Island tower. You steer 165°T at 4.8 kn until 1500, then 096°T at 7.6 kn until 1530.

   Give the 1530 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  

8. At 1540 you fix your position 053°T, 3.6 nm from Gannet Rock daybeacon. You steer 207°T at 7.2 kn until 1550, then 281°T at 4.0 kn until 1635.

   Give the 1635 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