Worksheet 490 · Skill 4
Two-bearing fix
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At 0900 you take two bearings with a hand-bearing compass: Mill stack bears 226°M and Kittle water tank bears 156°M.
Variation is 7°W (from the rose); a hand-bearing compass held away from the boat's steel is taken to have no deviation. Convert to true, plot the two lines of position, and give the fix as the true bearing FROM Tern Island tower to the fix, and the distance.
Tolerance: 2° and 0.15 nm (or 4 % of the distance).
Bearing from Tern Island tower: ________ °T Distance: ________ nm
At 1635 you take two bearings with a hand-bearing compass: Mill stack bears 221°M and Kittle water tank bears 158°M.
Variation is 7°W (from the rose); a hand-bearing compass held away from the boat's steel is taken to have no deviation. Convert to true, plot the two lines of position, and give the fix as the true bearing FROM Gannet Rock daybeacon to the fix, and the distance.
Tolerance: 2° and 0.15 nm (or 4 % of the distance).
Bearing from Gannet Rock daybeacon: ________ °T Distance: ________ nm
At 1320 you take two bearings with a hand-bearing compass: Mill stack bears 166°M and Heron Point Light bears 257°M.
Variation is 7°W (from the rose); a hand-bearing compass held away from the boat's steel is taken to have no deviation. Convert to true, plot the two lines of position, and give the fix as the true bearing FROM Green can "1" to the fix, and the distance.
Tolerance: 2° and 0.15 nm (or 4 % of the distance).
Bearing from Green can "1": ________ °T Distance: ________ nm
At 1305 you take two bearings with a hand-bearing compass: Mill stack bears 209°M and Heron Point Light bears 271°M.
Variation is 7°W (from the rose); a hand-bearing compass held away from the boat's steel is taken to have no deviation. Convert to true, plot the two lines of position, and give the fix as the true bearing FROM Green can "3" to the fix, and the distance.
Tolerance: 2° and 0.15 nm (or 4 % of the distance).
Bearing from Green can "3": ________ °T Distance: ________ nm
At 1630 you take two bearings with a hand-bearing compass: Mill stack bears 223°M and Westfield church spire bears 298°M.
Variation is 7°W (from the rose); a hand-bearing compass held away from the boat's steel is taken to have no deviation. Convert to true, plot the two lines of position, and give the fix as the true bearing FROM Gannet Rock daybeacon to the fix, and the distance.
Tolerance: 2° and 0.15 nm (or 4 % of the distance).
Bearing from Gannet Rock daybeacon: ________ °T Distance: ________ nm
At 0945 you take two bearings with a hand-bearing compass: Westfield church spire bears 290°M and Heron Point Light bears 223°M.
Variation is 7°W (from the rose); a hand-bearing compass held away from the boat's steel is taken to have no deviation. Convert to true, plot the two lines of position, and give the fix as the true bearing FROM Green can "1" to the fix, and the distance.
Tolerance: 2° and 0.15 nm (or 4 % of the distance).
Bearing from Green can "1": ________ °T Distance: ________ nm
At 1240 you take two bearings with a hand-bearing compass: Heron Point Light bears 222°M and Gannet Rock daybeacon bears 112°M.
Variation is 7°W (from the rose); a hand-bearing compass held away from the boat's steel is taken to have no deviation. Convert to true, plot the two lines of position, and give the fix as the true bearing FROM Red nun "2" to the fix, and the distance.
Tolerance: 2° and 0.15 nm (or 4 % of the distance).
Bearing from Red nun "2": ________ °T Distance: ________ nm
At 1250 you take two bearings with a hand-bearing compass: Kittle water tank bears 152°M and Heron Point Light bears 276°M.
Variation is 7°W (from the rose); a hand-bearing compass held away from the boat's steel is taken to have no deviation. Convert to true, plot the two lines of position, and give the fix as the true bearing FROM Gannet Rock daybeacon to the fix, and the distance.
Tolerance: 2° and 0.15 nm (or 4 % of the distance).
Bearing from Gannet Rock daybeacon: ________ °T Distance: ________ nm
Practice Sheet No. 1
Answer key
| No. | Answers | Problem |
|---|---|---|
| 1 | Bearing from Tern Island tower: 151 °T Distance: 2.70 nm | No. 490001 (worked solution) |
| 2 | Bearing from Gannet Rock daybeacon: 317 °T Distance: 0.94 nm | No. 490002 (worked solution) |
| 3 | Bearing from Green can "1": 120 °T Distance: 0.91 nm | No. 490003 (worked solution) |
| 4 | Bearing from Green can "3": 162 °T Distance: 2.55 nm | No. 490004 (worked solution) |
| 5 | Bearing from Gannet Rock daybeacon: 234 °T Distance: 2.34 nm | No. 490005 (worked solution) |
| 6 | Bearing from Green can "1": 002 °T Distance: 1.14 nm | No. 490006 (worked solution) |
| 7 | Bearing from Red nun "2": 356 °T Distance: 1.31 nm | No. 490007 (worked solution) |
| 8 | Bearing from Gannet Rock daybeacon: 162 °T Distance: 1.96 nm | No. 490008 (worked solution) |