Electronic compass GDM355

3Dtilt-compensated

Product overview
The GDM355/GDM365 is a compact 3D dynamic electronic compass integrating a 12‑axis inertial measurement unit (3‑axis attitude, 3‑axis accelerometer, 3‑axis gyroscope, 3‑axis magnetometer). It fuses high‑dynamic gyroscope response with stable accelerometer outputs and dynamic inertial algorithms to provide real‑time pitch and roll during complex maneuvers. Geomagnetic azimuth is corrected using hard‑iron and soft‑iron calibration and planar rotation compensation to suppress magnetic interference. The unit computes heading in real time and applies dynamic tilt compensation to deliver reliable heading output at tilt angles up to ±85°. Equipped with a high‑performance DSP, standard interfaces include RS232, RS485 and TTL; custom interfaces available on request.

Key features

• Tilt resolution: 0.1°
• Default power supply: DC 5 V (custom DC 9–36 V available)
• Standard outputs: RS232 / RS485 / TTL; binary high‑performance protocol
• Static tilt accuracy: 0.2°; Dynamic tilt accuracy: 0.5°
• Hard‑iron and soft‑iron calibration; planar rotation (2D) for magnetic interference
• Adjustable output rate: 5–100 Hz; baud rate: 4800–115200

Technical specifications

• Model: GDM355 / GDM365
• Heading accuracy: 1°
• Heading resolution: 0.1°
• Pitch range: ±90°
• Roll range: ±180°
• Tilt accuracy: static 0.2°, dynamic 0.5°
• Tilt resolution: 0.1°
• Tilt compensation range: Roll ±180°; Pitch < 85°
• Three‑axis magnetic range: ±800 µT
• Startup delay: < 50 ms
• Output rate: 5–100 Hz (adjustable)
• Baud rate: 4800–115200
• Output format: Binary high‑performance protocol
• Power: default DC +5 V (custom DC 9–36 V)
• Current: MAX 45 mA; Idle 35 mA
• Operating temperature: -40 °C to +85 °C; Storage: -40 °C to +85 °C
• Vibration resistance: 2500 g; Vibration spec: 10 grms / 10–1000 Hz
• Shock resistance: 100 g @ 11 ms, triaxial (half‑sine)
• EMC: compliant with EN61000 and GBT17626
• Insulation resistance: ≥100 MΩ

Applications & suitability
Designed for harsh and vibration‑intensive environments, the GDM355/GDM365 is suitable as a compact heading reference for marine vessels, antenna and satellite search systems, unmanned surface vehicles (USV), stabilized platforms and other navigation or control systems that require continuous and reliable heading under tilt and magnetic disturbance.

Mechanical & electrical details

• Dimensions PCBA: L33 × W27 × H9 mm; Case: L55.5 × W37 × H24 mm
• Cable length: PCBA trace 20 cm ±3 cm; Case trace 200 cm ±10 cm
• Weight: PCBA ≤ 25 g; Case pack ≤ 117 g (excluding cables)
• Interfaces: RS232 / RS485 / TTL; custom interfaces on request