The rapid development of information technology and internet technology in recent years has enabled a practical distribution of Global Navigation Satellite System (GNSS) data via internet. Real-time processing of GNSS data is in great demand, for example, a machine guidance system for agricultural applications requires reliable positioning in real-time. However, real-time transfer of GNSS data can be risky unless the data quality can be monitored. This paper will illustrate how emerging web and communication technologies can be combined to deliver and monitor GNSS data on the web in real-time. A prototype web application was developed in order to demonstrate the feasibility of a web-based real-time GNSS data system.