Which statement is correct regarding a NMEA 2000 system?

The statement regarding NMEA 2000 systems that is accurate highlights that NMEA cables simultaneously provide both power and data through a single cable. This distinct feature is one of the key aspects of the NMEA 2000 standard, which allows devices on the network to communicate while also receiving the necessary power to operate. This dual functionality simplifies the wiring and installation process on vessels, making it more efficient by reducing the number of individual cables needed for data transmission and power supply.

The NMEA 2000 protocol utilizes a bus topology, where devices can be added or removed without disrupting the overall network. This design is supported by the power and data being transmitted over the same network, ensuring that all devices can communicate seamlessly while being powered adequately.

In contrast, the other statements about the NMEA 2000 system contain inaccuracies. While resistors do play a role in terminating the network, they should not be distributed throughout the system—terminated properly only at each end. NMEA cables are not strictly for data transfer; they also facilitate power delivery. Lastly, multiple terminating resistors are not needed; only two are necessary and are strategically placed at the ends of the cable runs to maintain signal integrity.