Gmm-g3 - GNSS module for GPS, GLONASS, Galileo & QZSS applications

GlobalTop Technology GNSS module, based on the MediaTek MT3333 chipset, supports GPS, GLONASS, Galileo (on request), QZSS, SBAS, DGPS and AGPS.

The GlobalTop Gmm-g3 module utilizes MediaTek's new generation MT3333 GNSS chipset and supports various location and navigation applications including autonomous GPS, GLONSS, GALILEO (on request), QZSS, SBAS, DGPS (RTCM) and AGPS. The Gmm-g3 supports up to 210 PRN channels with 99 search channels and 33 simultaneous tracking channels.

The MT3333 chipset has the industry's highest level of sensitivity (-165dBm) as well as instant Time-to-First Fix (TTFF). It also combines many advanced features including AlwaysLocate™, EASY™, EPO™ and logger function.

Gmm-g3 is the ideal SMD solution for those who wish to incorporate GNSS functions in small form factor applications.


  • MediaTek MT3333 Chipset, 33 tracking / 99 acquisition-channel GPS/GLONASS/GALILEO receiver
  • Minimal dimensions 11.5 x 13 x 2.1 mm
  • SMD
  • Ultra-high sensitivity, -165 dBm, TCXO Design
  • GlobalTop Firmware customization services
  • Acquisition: 35mA (typical)
  • Tracking: 29mA (typical)
  • E911, RoHS Compliance

Please contact us for more information on GlobalTop's comprehensive range of positioning modules and support services.

Dimensions 11.5 x 13 x 2.1mm, SMD type
Chipset MTK MT3333, 99 Channels
Frequency GPS L1, 1575.42MHz
GLONASS L1, 1598.0625~1605.375MHz
GALILEO E1, 1575.42MHz
Sensitivity Acquisition -148dBm
Tracking -165dBm
Position Accuracy Without aid: 3.0m (50% CEP)
TTFF (Time to First Fix) Cold Start: <35 seconds (typical)
Warm Start: <33 seconds (typical)
Hot Start: <1 second (typical)
Timing Accuracy (1PPS Output) ±10ns RMS
Protocol NMEA 0183, MTK Command
AGPS Supported (Offline Mode)
Interface 2 UART
Baud Rate 4800 ~ 115200 bps
Update Rate 1 ~ 10 Hz
Power Supply VCC: 3.0V to 4.3V
VBACKUP: 2.0V to 4.3V
Current Consumption Acquisition: 35 mA
Tracking: 29 mA
Working Temperature -40°C to +85°C
  • Vehicle Tracking (AVL)
  • Personal Tracker
  • Covert Asset Tracking
  • Mobile Devices
  • PND
  • M2M
  • Precise Timing Equipment

Compare's range of GPS and GNSS standalone and antenna modules here

Part Number Description

GlobalTop Gmm-g3 GNSS Module, external antenna required, 99 channels, 13 x 9.5 x 2.1mm


GlobalTop GPS module evaluation kit with User Manual, Software Application Program, CP210X USB Bridge VCP driver, MiniGPS tool with user manual, USB Connector Cable, External Antenna (where applicable).

N.B. The required module for evaluation must be specified when ordering.

The GlobalTop GPS Module Evaluation Kit is the best way of testing the performance of GlobalTop Mediatek GNSS modules. Not only does it simplify the evaluation process, it also helps engineers during the design phase.

G.topEvalKit-300pxThe evaluation board can communicate with a computer via a USB cable, and the module can be controlled through the Mini GPS Tool or PMTK commands (available through request).

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Last updated: 17 April 2017