Gmm-U2P - IVORY 3: High Sensitivity & Ultra Low Power GPS Module

The Gtop Ivory 3, Gmm-U2P GPS module offers both high sensitivity, and incredibly low power consumption (15mA @ Tracking / 19mA @ Acquisition) in an ultra-small package of just 9nn x 12.7nn x 2.1 mm.

At a dimension of 9 x 12.7mm, GlobalTop Technology's Gmm-U2P is smaller than its previous generation predecessor.  Gmm-U2P is a high sensitive, incredibly low power consumption (15mA @ Tracking / 19mA @ Acquisition) GPS module.

It utilizes MediaTek's fourth generation MT3339 single chip GPS technology that supports up to 66 channels of satellite searching with -165dBm sensitivity and 10Hz maximum update rate and many of GlobalTop's advanced software customization services.

Gmm-u2p features:

  • MediaTek MT3339 Chipset, L1 Frequency, C/A Code, 66 channels
  • Ultra-small Dimension, 9 x 12.7 x 2.1 mm; SMD
  • Ultra-high Sensitivity, -165 dBm, TCXO Design
  • Position Accuracy: <3.0M 50% CEP
  • Multi-path Compensation ; E-GSM-900 band rejection
  • UART (TTL) ; 1PPS Support
  • NMEA 0183 and PMTK protocol support
  • E911, RoHS Compliance

Global Top can provide a free firmware customization service so that GPS devices are custom configured with your prefered settings at the factory. Ask our sales team about this free service.

Gmm-u2p GPS Module Specifications


9 x12.7 x 2.1 mm, SMD type

GPS Solution:

MTK MT3339, 66 Channels


L1, 1575.42 MHz ; C/A Code Sensitivity:

Acquisition -148 dBm

Tracking -165 dBm

Position Accuracy:

Without aid: 3.0 m 2D-RMS


TTFF (Time to First Fix):

Cold Start: <35 Seconds (Typical)

Warm Start: <33 Seconds (Typical)

Hot Start: <1 Seconds (Typical)

Timing Accuracy (1PPS Output):

10 ns RMS


NMEA 0183, MTK Command




Supported (Offline Mode)



Baud Rate:

4800 ~ 115200 bps

Update Rate:

1 ~ 10 Hz

Power Supply:

VCC: 3.0 V to 4.3 V

VBACKUP: 2.0 V to 4.3 V

Current Consumption:

Acquisition:19 mA

Tracking: 15 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
Gmm-u2p Ivory 3 GPS Module, 66 channels, 9mm x 12.7mm x 2.1mm. External antenna required.

GPS EV-Kit 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 Mediatek GPS modules. Not only does it simplify the evaluation process, it also helps engineers during the design phase.AlphaMicro_GlobalTop_GNSS_EV Kit_Standalone_300px

The 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