VisualGPSView is a free tool that incorporates many advanced features that show the status of the GPS receiver via the NMEA 0183 protocol.
Main features:
- NMEA/GLONASS - Supports GPS NMEA and GLONASS NMEA
- Azimuth and Elevation Plot - View all satellites that are in view. Each satellite identifies its pseudo random number (PRN) and its azimuth and elevation.
- Scatter Plot - The scatter plot shows individual position samples referenced to several type of reference types, next sample, average or user defined.
- Signal Quality/SNR Window - Monitor satellite signal to noise ratios and see them graphically on the screen. The signal quality window will grow or shrink to accommodate number of satellites in view
- Position Plot - Monitor latitude, longitude and altitude averages.
- NMEA Command Monitor - View NMEA sentences as they are received
- NMEA Recording and Playback - Record NMEA directly to a file or read NMEA from a file. NMEA files consists of standard NMEA sentences in text ASCII characters.