Explanation: NMEA 2000 is a serial data network standard used in marine electronics, based on the Controller Area Network (CAN bus) protocol. To view data from an NMEA 2000 network on a standard computer, which typically lacks a native CAN bus interface, a device is needed to translate the data's format and protocol. A **gateway** (D) serves this purpose by translating data between fundamentally different communication protocols or network architectures. An NMEA 2000 gateway converts the CAN bus-based NMEA 2000 messages (Parameter Group Numbers or PGNs) into a format a computer can understand, such as NMEA 0183 serial data, USB, or Ethernet, allowing software on the PC to interpret and display the information. A voltmeter (A) measures electrical potential and cannot interpret digital data. A generic "converter" (B) typically changes one signal type or physical layer to another (e.g., voltage levels), but a gateway specifically performs complex protocol translation across different network standards. HyperTerminal (C) is software that displays serial data but does not perform the hardware translation necessary to interface with an NMEA 2000 network.