4D Systems, Australia


Pluggable micro-SD GPS Module
This product us RoHS compliant This product is PbFree


MOTG-GPS is a small pluggable GPS module ideally suited for embedded systems. It incorporates a complete solution GPS engine module with an integrated finely tuned highly sensitive Patch-On-Top (POT) ceramic antenna and has a wide range of uses in educational, experimental as well as during any development phase where a quick GPS solution is required. It comes in a micro-SD memory card format which is designed to interface to any embedded platform that has an on board micro-SD (or SD) card adaptor.

Complete NMEA messages as well as specific  information such as Longitude, Latitude, Heading, Time, Date, Speed and many more features are built inside the MOTG-GPS. The module utilises the standard SPI signals and acts as a slave device to the host micro. It offers a simple yet effective command set to any host platform that can communicate via a SPI port and all GPS related commands are sent using a simple protocol.

MOTG-GPS device simply plugs into a standard µSD/SD socket for quick assembly and maintenance, no need to solder and end up with a wiring nest. Don't need the device permanently, or want to make it optional? Simple, just unplug.

The MOTG-GPS is a novel concept from 4D Systems that belong to a broader range of Modules-On-The-Go series. Some of the other modules on offer are:
  • MOTG-96: Pluggable 0.96" 96x64 OLED display module in a micro-SD card format.
  • MOTG-128: Pluggable 1.5" 128x128 display module in a micro-SD card format.
  • MOTG-RF24G: Pluggable 2.4Ghz RF Transceiver module in a micro-SD card format. 
  • MOTG-WiFi: Pluggable Wifi module in a micro-SD card format. 
  • More modules coming very soon....


  • Low-cost pluggable GPS module.
  • Easy micro-SD card form factor that will plug into any embedded host platform that has a micro-SD or SD card adaptor.
  • SPI interface to the host via the micro-SD or SD adaptor.
  • Comprehensive set of built in high level GPS commands.
  • Based on MediaTek Single Chip Architecture, MT3329.
  • Patch Antenna Dimensions : 15mm x 15mm x 4mm.
  • L1 Frequency, C/A code, 66 channels.
  • High Sensitivity : Up to -165dBm tracking, superior urban performance.
  • Position Accuracy : < 3m CEP (50%) without SA (horizontal).
  • Supports up to 210 PRN channels.
  • Jammer detection and reduction.
  • Multi-path detection and compensation.
  • Cold Start : under 35 seconds (Typical).
  • Warm Start : under 34 seconds (Typical).
  • Hot Start : under 1 second (Typical).
  • Supports NMEA0183 V3.01 data protocol.
  • RoHS Compliant.


Data Sheets: The latest data sheets for the module are available here:
     - MOTG-GPS-DS-rev2.pdf

PmmC File: PmmC is an abbreviation of Personality-module-micro-Code. The GOLDLEOX chip used in the MOTG device is a custom controller and all functionality including the high level commands are built into the chip. This chip level configuration is available as a PmmC file and contains all of the low level micro-code information (analogy of that of a soft silicon) which define the characteristics and functionality of the MOTG device. The ability of programming the device with a PmmC file provides an extremely flexible method of customising as well as upgrading the MOTG with future enhancements. As we make further improvements, we will release PmmC file updates and you should check regularly to benefit from these enhancements. You can download the latest version from here:
     - MOTG-GPS-R10.PmmC

PmmC-Loader Software Tool: Windows based software tool to program the PmmC file into the MOTG module.
     - PmmC-Loader Tool link

4D Embedded GPS Software Test Tool: The 4D Embedded GPS Test tool is a free software tool to quickly test the functionality of the MOTG device using  your PC, prior to writing any piece of embedded code for your platform to communicate with the MOTG-GPS module. The Test Software simulates the embedded host controller and provides an easy means of exercising the available commands. 
     - 4D Embedded GPS Software Test Tool

Note: To use the MOTG module with the Embedded GPS Software Tool, you'll need to program the module with a special test PmmC file. The latest test PmmC can be found here: 
     - MOTG-GPS-SER-R10.PmmC

Embedded C Library Driver Source: Use the provided C source code to embed the functionality of the MOTG GPS module into your host platform.
     - MOTG_GPS_C_Lib.c

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