One of the reasons I hate Microsoft is because they removed the very helpful and free hypertext program from Windows after XP. It allowed you to monitor NMEA
data on a laptop
Unfortunately, the process is kind of geeky. You will need to disconnect the two NMEA
input wires from the 802, connect them to pins 2 (+) & 5(-) of a nine pin serial
cord, connect the serial plug
into a serial/usb converter, load the drivers for the converter, find the right com port, then set the monitoring program (hpertext, Opencpn
, gpsdiag,etc to the right baud rate (4800) and com port, and look at the data. If you see data, then work
on the 802 settings. If you don't see data, check the settings for source GPS output.
If you feel like getting more geeky, hook a scope
across the two wires and you will see little square waves dance across the screen
if there is data flowing.