I can't remember if the GPS 18x USB can put out anything NMEA related. I know the serial version does but think the USB version cannot.
Regardless, GPS Gate can find your GPS 18xUSB and put out a NMEA data stream you can use with any simple GPS reader. It might even show the data with its own functionality. You will be able to figure out latitude and longitude from reading the NMEA data and it won't cost a penny. http://gpsgate.com/download
See GPSGate Splitter on that page.