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Thank you for your patience,
The GPS aerial is a Navman 900 tracker.
The laptop runs windows 7 Pro
The software is Euronav seaPro 3000 standard series
Have you made a cable to connect from the Tracker 900 to the computer? You will need to use a serial cable (with a serial port on the laptop), not a USB (unless you're using a USB-to-Serial Adapter). If you try to connect directly from the 900 to wires on a USB cable you'll likely blow the USB ports up on your laptop.
Ok lets see:-
the set up I have was supplied in total by Euronav comprising
Gps usb, (which is not ideal as its mounted by the chart table not outside)
there is a serial to USB driver installed on the laptop, all the above are connected through a powered hub.
The Navman tracker 900 chartplotter/GPS is no longer in use, so I was hoping to use the GPS from this and connect it to the laptop via existing usb hub.
The Navman tracker 900 GPS is now powered from a separate 12v supply and already supplies the VHF radio with NMEA signal using Green & Ground wires from the GPS.
On attaching the same wires to a usb plug (red disconnected) I was hoping to get a result, but not so