Delorme does not recognize the S&T GPS receiver as a USB device. However it will work as a serial input.
Open
Streets & Trips and Click on Tools-GPS-Configure GPS Receiver. The resulting screen will show you what COM port the receiver is on ( the highlighted one). Click Cancel and close S&T
I am not sure what Delorme product you have. However if it the same as SA 2008, click on options in the top left corner. On the GPS tab, change the port from USB to the COM port identified by S&T. Click on OK and you should see a GPS signal.
Terry