No, NMEA (National Marine Electronics Association) is not an Ethernet. NMEA is an organization that establishes communication standards for marine electronics devices.
While Ethernet is a widely used communication protocol for local area networks (LANs) and wide area networks (WANs), NMEA standards define a set of protocols for data communication among marine electronics devices, such as GPS units, chartplotters, depth sounders, and marine radios.
While Ethernet and NMEA protocols are different, they may be used in conjunction with each other in some marine electronics applications. For example, a chartplotter may use NMEA 2000 or NMEA 0183 to communicate with other devices on a boat, while also being connected to a computer or other device using Ethernet for data transfer.
