NMEA 2000

NMEA 2000 (often abbreviated as N2K) is a standardized, high-speed data network used to connect marine electronic devices. Based on the Controller Area Network (CAN) bus, it allows devices from different manufacturers to communicate and share data, such as GPS information, engine data, depth readings, wind speed, and heading.

Developed and maintained by the National Marine Electronics Association (NMEA), NMEA 2000 provides a robust and reliable network compared to its predecessor, NMEA 0183. Key features include plug-and-play connectivity, a self-configuring network, and the ability to transmit more data at a faster rate. Each device on the network is assigned a unique address, and messages are broadcast to all devices, allowing relevant data to be processed by those needing it.

The NMEA 2000 standard defines the physical layer, data format, and communication protocols required for interoperability. This includes cabling specifications (a shielded twisted-pair cable terminated with Micro-C connectors), message formats known as Parameter Group Numbers (PGNs), and addressing schemes. Certification by the NMEA ensures that a device conforms to the NMEA 2000 standard, promoting seamless integration within the network.

NMEA 2000 is widely used in recreational and commercial marine applications, enhancing navigation, monitoring, and control systems on boats and ships.