Dealing with the Multiple Interfaces of  Boat Electronics
Consider the alternatives

Serial connections are most often point-to-point between computers, or between computers and NMEA 0183-compatible devices. NMEA 0183 runs at the slow speed of 4800 bits per second (4800 bps). Generally, serial cables of 10 feet or so will run up to 56,000 bits per second (56 Kbps).
USB is a branching tree intended to connect devices to a single computer.  It comes in several versions with increasingly higher speed. Originally intended for slow devices like keyboard, full-speed USB 2.0 is fast enough to run external hard disks.
While both technologies are from the National Marine Electronics Association, they are radically different. NMEA 0183 is a low-speed  serial device oriented to having a single "talker" and one, or sometimes more than one, "listener".  It runs at 4800 bits per second (bps), although it is often possible to make it work with faster devices, such as AIS. AIS normally operates at 38,400 bits per second (38.4  Kbps).

NMEA 2000, physically, is much different, being built around a backbone cable with drops rather than point-to-point topology. It is much faster than NMEA 0183, although still not as fast as Ethernet and proprietary derivatives of Ethernet.  Devices can draw substantial power (4 or 8 amps) from the backbone.  NMEA 2000,depending on factors such as current draw, can have a backbone that is 328 feet (100 meters) or 656 feet (200 meters) long.
Modern Ethernet (technically a family of standards under the IEEE 802.3 label) begins with a speed of 10 million bits per secomd (Mbps), 40 times faster than NMEA 0183. 100 Mbps Ethernet is commonplace.  It is possible to power devices from Ethernet, although relatively low current and with voltages characteristic of the telephone industry.

Ethernet was once a backbone cable technology, but now, beyond simple point-to-point connections,  it connects devices, typically with cables up to 100 meters long, to switches; the switch is the center of a star. Switches can be interconnected, including with optical fiber cable immune to electrical noise and long enough to service an aircraft carrier rather than a fishing vessel.  While such speeds are unlikely to be needed in marine electronics, variants go as fast as 10 billion bits per second (10 Gbps).

100 Mbps Ethernet can keep up with most marine displays, but that is worth testing. There are other graphics-intensive applications, such as movie special effects, that need the highest speeds.
Marine electronics manufacturers have a variety of networking technologies that officially are unique to them, but are often, although not always, based on Ethernet

Some of the earlier versions are daisy-chained.