Why is the GPS signal intermittent on my Window CE/Mobile 5.0+ device?
Windows Mobile 5.0 comes with something known as the “GPS Intermediate Driver” (GPSID). This feature is supposed to help make it possible for multiple applications to share the GPS data. You can tell if a particular COM port is being supplied by this driver by going to Start->System tab->GPS, and looking at the “GPS Program port” listed on the Programs tab. Microsoft managed to do it wrong with that “GPS Program Port”… they process and filter the data and don’t pass it to the application if they don’t think it’s changing. MountainScope interprets this as a physical loss of connectivity to the GPS. If a given COM port is a port supplied by the GPSID, we have found those precise symptoms when using this “GPS program port”. However, if you use the “GPS Device” from the list (instead of the COM port), then it works much better. Or, turn off the GPSID completely, by selecting None in the GPS Hardware Port (on the Hardware Tab) and resetting the device. Then you would use the hardware port
