I think this GPS unit outputs serial data in the NMEA format. In theory, you can use any device with a serial port to receive it and then display the raw data in a terminal.
NMEA, with way more detail than you need, is described at this link:
You could even use a Particle device to take the serial data from the serial port, and then echo it to the serial over USB port (a very simple firmware; just a few lines). Connect the USB to a computer and then use a terminal software (such as PuTTy) to view the data stream.
That would at least let you know what the GPS is doing.