NMEA 2000 network Alert PGNs seem great, so why are they hardly used?
Most of us get to see the NMEA 2000 data sharing standard doing good on our boats, like how the N2K output of a GPS receiver — or heading sensor, or AIS transponder, etc. — can be seen and used by almost any network display regardless of brand. But I’m sorry to report that most of us have also been missing out on a valuable NMEA 2000 feature that’s been available for over a decade. I’m talking about the set of Alert PGNs — i.e. bundles of subject-specific data and command fields known by their Parameter Group Numbers — that theoretically permit any N2K device to send standard or custom alerts to any display, which…