GPS NMEA Toolkit from Accord provides a comprehensive Application Programming Interface (API) for software developers to interface their Windows applications with standard GPS receivers. Applications that require real-time GPS receiver data can use the API to interface with standard GPS receivers without having to worry about the complexity of handling the serial port, extraction of the GPS data from the NMEA messages and performance analysis of the receiver. The Toolkit supports most commonly used NMEA messages from a GPS receiver. It provides all the required services to read the GPS data from the serial port and update the application with latest GPS data in the real-time mode and analyze the receiver s performance. Stored NMEA data can also be read from files to carry out analysis through API function calls. The Toolkit is provided as a Dynamically Linked Library (DLL), which can be accessed by any Windows based application through API calls.