GM-82 is a satellite positioning receiver produced by HOLUX. It uses the second-generation low-power satellite positioning receiver chip designed by SiRF company. It has the characteristics of low power consumption, fast positioning and tracking 12 satellites. It is suitable for automotive navigation, security systems, map making, various surveys to agricultural applications.
The GM-82 is a smart satellite‑receiving module that uses a SiRF second‑generation low‑power chip to track up to 12 satellites and deliver position, speed and time data. It supports RS‑232 and TTL interfaces, optional backup battery, and offers power‑saving modes such as Trickle Power and Push‑to‑Fix.
The manual covers product introduction, technical specifications, hardware pin definitions, software NMEA/RTCM output formats, initialization and navigation procedures, default settings, ordering information, and warranty details. This manual is written in Chinese.
| Board dimensions | 40 mm × 50 mm × 12 mm |
|---|---|
| Weight | 18 g |
| Operating temperature | –40 °C ~ +85 °C |
| Storage temperature | –45 °C ~ +100 °C |
| Input voltage | 5.0 V ± 10 % or 3.3 V ± 10 % |
| Backup battery (optional) | 3 V rechargeable Li‑ion, data retention 1 000 h |
| Antenna connector | MCX |
| Maximum simultaneous satellites tracked | 12 |
| Position update rate | 1 Hz (once per second) |
| Cold‑start acquisition time | ≈ 45 s |
The GM-82 can track up to 12 satellites simultaneously.
The default settings are 4800 bps baud rate, 8 data bits, 1 stop bit, and no parity.
It operates from –40 °C to +85 °C.
Apply a low‑level signal to the PBRESEN pin; the module will perform a hot‑start reset.