This software is designed to facilitate the hobby of launching and tracking down weather balloons by the plotting of a GPS's location on Google Earth, via the NMEA format. As a bonus this software will predict an airborne balloon payload using U.S. weather sounding data and take many variables into account.
GPSPS also allows multiple plots to be active at once. Input should follow the NMEA format, currently only GPRMC or GPGGA NMEA messages are supported.