The Linx MDEV-GPS Master Development System provides the tools needed to rapidly evaluate SG or SR Series Global Positioning System (GPS) modules. The Master Development System includes a pre-assembled development board with on-board OLED display for stand-alone testing. The system connects to a personal computer (PC) by means of a Universal Serial Bus (USB) interface and supplied software. The software shows satellite positions, signal-to-noise ratio (SNR), satellites in use, NMEA data, coordinates, and a module's position on a Google map. A convenient prototyping area with breakout headers and regulated power supply allows for rapid testing and interface connections. Versions are available for SG and SR modules.