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GPS 20x NMEA 0183 Support
The GPS 20x will work with other NMEA (National Marine Electronics Association) supported devices when using a program that creates a virtual serial port for a connected USB device.
To do this, Garmin recommends using an application called GpsGate. GpsGate is a free, third-party application designed to translate the data from a USB GPS antenna into NMEA 0183 data, for use with other third-party applications and devices.
GpsGate can be downloaded here.
Note: GpsGate is a third-party application and, as such, is not directly supported by Garmin. For assistance with the GpsGate application, please contact the developer here.