How can NMEA 2000 be connected to older NMEA 0183 devices?

• A. Directly via USB adapter.
• B. They cannot be connected.
• C. Using an NMEA 2000 to NMEA 0183 gateway that translates PGNs to 0183 sentences and vice versa.
• D. By converting the 0183 to Wi-Fi.

Answer: (C)

Connecting NMEA 2000 with older NMEA 0183 devices requires a gateway that translates between the two protocols. NMEA 2000 runs on a CAN bus and uses PGNs (Parameter Group Numbers) to describe data, broadcasting information to all devices on the network. NMEA 0183 is a separate serial, ASCII-based standard where devices communicate with individual sentences such as GGA or RMC. Because the data formats, framing, and electrical characteristics are different, you can’t just splice the two networks together. A gateway bridges them by receiving PGNs on the NMEA 2000 side, translating them into appropriate NMEA 0183 sentences for the 0183 devices, and doing the reverse when 0183 devices send data. This two-way translation is what makes interconnection possible. USB adapters don’t apply here, since NMEA 2000 isn’t USB, and the statement that they cannot be connected is incorrect. While you might see references to converting 0183 to Wi‑Fi, that still relies on a gateway or bridge to handle the protocol translation; the essential mechanism is the NMEA 2000 to NMEA 0183 gateway.