The 'gyrotheodolite' is used in underground surveying to:
Choose the correct answer
Measure slope angles underground
Determine true north independent of magnetic field — essential for accurate alignment in tunnels and mines
Measure underground water table
Locate mineral veins
Correct Answer
B. Determine true north independent of magnetic field — essential for accurate alignment in tunnels and mines
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Gyrotheodolite: determines true north astronomically (gyroscopic compass) in underground/tunnels where magnetic compass is unreliable (metal, magnetic anomalies). Gyroscope aligns to Earth''s rotation axis (true north). Accurate to ±0.3'' angular. Used in: tunnel alignment, mine surveying, navigation. Critical for long tunnels bored from both ends to meet accurately.
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