I'm guessing you are looking at the stream info outside of
OpenCPN with a utility like GPSinfo or GPSutility.
Is the
boat icon grey or red? If grey,
OpenCPN is not seeing the
gps data.
Also note the color of the upper right icon with a
satellite and
compass symbol. Green or red? Green is good to go, red means no data connection.
Check the tools settings (wrench icon) at the
GPS tab. Check to be sure the data source field indicates your
puck connection port. And note if the baud rate is correct.
Also you might connect in
Google Earth to verify function as well.
If your seeing a data stream, most likely the settings in OpenCPN need reviewing and correcting.