NF701 Fiber Optic North Finder delivers fast, accurate true-north orientation for navigation and targeting systems. Using a high-performance fiber optic gyroscope to detect the Earth’s rotation, it computes azimuth and attitude angles automatically within 3 minutes.
Compact (115 × 90 × 110 mm) and lightweight (≤2 kg), the system integrates a FOG, accelerometer, rotation control device, and embedded computing unit.
With north-seeking accuracy up to 0.3° (1σ) and power consumption of only 15 W, it’s ideal for UAVs, land vehicles, and shipborne systems requiring magnetic-free north finding. Operating temperature range is -40 °C to +70 °C, with RS-422 communication and DC 12–24 V power input.

Overall dimensions

Dimension (mm): 115 × 90 × 110

1.2 Main technical indicators

A) North seeking time: ≤ 3 min;

B) North seeking accuracy (1σ): ≤ 0.3 ° (NF701A); ≤ 0.5 ° (NF701B)

C) Horizontal accuracy: ≤ 0.05 ° (1σ);

D) Circumference: ≤ 0.5 ° (1σ)

E) Weight: ≤ 2 kg;

F) Power supply: DC 12V ~ 24V;

G) Power consumption: 15 W (peak);

H) Interface: RS422

I) Working mode: start automatic self-check after power on, control north seeking by the upper computer, and send north seeking results to the upper computer after north seeking is completed;

1.3 Environmental requirements

1) Working temperature: -40 ℃ ~ + 70 ℃;

2) Storage temperature: -55 ℃ ~ + 85 ℃.

3) Humid and hot environmental conditions: relative humidity is less than 95%.

4) Appearance: The metal surface shall be free of rust, and the coating shall be free of blistering, peeling, etc.

1.4 Electrical performance

Insulation resistance: the insulation resistance between the independent circuits of the fiber optic gyroscope north finder and between the circuit and the shell shall not be less than 10 MΩ under standard atmospheric conditions.

1.5 Reliability and maintainability

MTBF ≥ 1000 hours;

MTTR ≤30min.

1.6 External interface

1.6.1 With DC12 V ~ 24V power input.

1.6.2 With serial port output function.

1.8.3 External plug:

Interface Y50EX-0607TX2, see the table below for pin definition.