NMEA 2000 is the network that lets the boat's electronics share data: the GPS position, heading, depth, wind, engine data and autopilot commands all travel over it. Raymarine's SeaTalk NG is compatible with NMEA 2000, using its own connectors.

This video explains what NMEA networks are for and how they work, then installs a SeaTalk NG network on my boat Renko. The network is a backbone with a terminator at each end, and each device joins it with a spur cable. The backbone needs power, and every device on it draws a known load, its Load Equivalency Number (LEN), which decides where the power should be fed in. If a device doesn't appear on the display, check its spur connection, the terminators and the power to the backbone.

Timestamps: introduction to NMEA networking 0:00, installation 8:00, checking the devices appear 25:52, powering the backbone and LEN ratings 28:10. See also NMEA for beginners.