Underground Mining North Seeker Fiber Optic Gyro Compass 0.3° Accuracy, IP65 Rugged Body, Tunnel Boring Machine Heading Reference, No GPS Needed

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Key Technical Parameters

● North-seeking range: ±70° (latitude range)

● North-seeking accuracy: ≤0.3° (1σ)

● Repeatability: ≤0.1° (1σ)

● North-seeking time: ≤3 min

● Circular linearity (1σ): ≤0.3°

● Operating voltage: AC220V ±10%, 50Hz

● Power consumption: ≤ 50W

● Weight: ≤ 6kg

Step 1 — Mount the device

• Place the north finder on a stable tripod, platform, bracket, or vehicle mount.

• Keep it level​ within the device’s tilt range (commonly ±15°).

• Avoid continuous vibration during the north-seeking process.

Step 2 — Power and wiring

• Supply recommended DC voltage (9–36V or 24V depending on model).

• Connect communication interface: RS232 / RS422 / RS485 / CAN / Ethernet.

• Connect to PC, PLC, IMU, INS, or onboard controller.

Step 3 — Warm-up / self-check

• Power on.

• Device runs self-test and gyro bias estimation.

• Warm-up time: a few seconds to a few minutes depending on model.

Step 4 — Start north seeking

• Use button / LCD / host software / serial command.

• The internal FOG or MEMS gyro rotates/indexes to several positions.

• Earth rotation components are measured and filtered.

Step 5 — Read azimuth

• After alignment (typically ≤3 min​ for FOG, ≤5 min​ for some MEMS/rugged units), the device outputs:

  • True north azimuth

  • Pitch

  • Roll

  • Heading uncertainty / status flag

Step 6 — Transfer reference

• Align your radar, antenna, total station, drill tool, vehicle frame, or INS to the north finder datum.

• Save zero-angle offset in your system.

Step 7 — Re-align when needed

• After long movement

• After power loss

• After mounting disassembly

• In new latitude zone

• After heavy shock/vibration