Worksheet 747 · Skill 3

Dead reckoning

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1. At 0715 you fix your position 070°T, 2.8 nm from Heron Point Light. You steer 056°T at 5.0 kn until 0735, then 128°T at 7.9 kn until 0755.

   Give the 0755 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 1030 you fix your position 211°T, 2.2 nm from Tern Island tower. You steer 190°T at 7.3 kn until 1045, then 273°T at 7.4 kn until 1055.

   Give the 1055 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 1330 you fix your position 353°T, 2.9 nm from Mill stack. You steer 181°T at 9.2 kn until 1340, then 001°T at 8.8 kn until 1425.

   Give the 1425 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 0805 you fix your position 236°T, 1.8 nm from Gannet Rock daybeacon. You steer 342°T at 5.7 kn until 0830, then 231°T at 4.1 kn until 0900.

   Give the 0900 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 1335 you fix your position 087°T, 2.3 nm from Gannet Rock daybeacon. You steer 011°T at 8.5 kn until 1345, then 218°T at 9.5 kn until 1410.

   Give the 1410 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 0940 you fix your position 059°T, 2.3 nm from Gannet Rock daybeacon. You steer 165°T at 8.0 kn until 1005, then 333°T at 5.2 kn until 1020.

   Give the 1020 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  

7. At 1430 you fix your position 060°T, 0.9 nm from Heron Point Light. You steer 041°T at 4.9 kn until 1505, then 168°T at 10.0 kn until 1525.

   Give the 1525 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 1000 you fix your position 334°T, 2.8 nm from Kittle water tank. You steer 277°T at 6.7 kn until 1015, then 048°T at 5.0 kn until 1030.

   Give the 1030 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