Worksheet 389 · Skill 3

Dead reckoning

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1. At 1140 you fix your position 229°T, 2.6 nm from Tern Island tower. You steer 080°T at 7.6 kn until 1150, then 261°T at 9.3 kn until 1230.

   Give the 1230 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 0720 you fix your position 358°T, 2.2 nm from Westfield church spire. You steer 124°T at 8.3 kn until 0805, then 260°T at 4.4 kn until 0820.

   Give the 0820 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  

3. At 1225 you fix your position 200°T, 1.3 nm from Tern Island tower. You steer 217°T at 6.0 kn until 1305, then 092°T at 7.0 kn until 1345.

   Give the 1345 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  

4. At 1335 you fix your position 023°T, 2.0 nm from Mill stack. You steer 068°T at 7.3 kn until 1350, then 227°T at 5.5 kn until 1400.

   Give the 1400 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  

5. At 1510 you fix your position 282°T, 2.6 nm from Tern Island tower. You steer 158°T at 7.4 kn until 1535, then 071°T at 8.4 kn until 1550.

   Give the 1550 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 1105 you fix your position 188°T, 1.9 nm from Gannet Rock daybeacon. You steer 258°T at 9.4 kn until 1115, then 108°T at 6.5 kn until 1125.

   Give the 1125 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 1405 you fix your position 057°T, 3.5 nm from Tern Island tower. You steer 228°T at 4.7 kn until 1430, then 119°T at 7.6 kn until 1500.

   Give the 1500 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 0710 you fix your position 049°T, 1.5 nm from Gannet Rock daybeacon. You steer 135°T at 5.6 kn until 0735, then 259°T at 6.1 kn until 0750.

   Give the 0750 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