Wherever there is a need to connect an NMEA 2000 device, a “T-piece” is inserted in to the backbone and a “Drop” cable used to connect the device to the T-piece. NMEA 2000 connectors are simple to connect to each other using threaded ends that screw together. Or at its simplest, just two T-pieces connected together. On a large yacht this could be made up of multiple cables connected in series running through the whole vessel. The first part of any NMEA 2000 network installation must be to decide the route taken by the backbone cable. Another is when a yacht engine’s data can be monitored on MFDs anywhere throughout the vessel, not just at the helm with the help of analogue to digital converters like the Actisense Engine Monitoring Unit (EMU-1). This means it can calculate how long it will take to empty the fuel tank – add vessel speed as well and the ‘distance until empty’ can also be calculated.
This is because it was a proven and robust standard already used by the agricultural, industrial and automotive industries. Connections are "plug and play", which makes it easy to build an NMEA 2000 network and connect devices from many different manufacturers due to the standardised wiring and connector system.Ī great example of how this can help the user in real life is when a yacht engine’s fuel flow meter and fuel tank level sensor share their data with the chart plotter. The NMEA chose the DeviceNet standard for its NMEA 2000 cables and connectors. The backbone can provide power to all low-powered devices (requiring less than 1 Amp) whilst sharing data among all of the devices on the network. Marine electronic devices from various manufacturers that are all NMEA 2000 certified can be safely connected to one central cable running through all relevant areas, known as a backbone. Over the past 10 years, it has become the primary standard used on leisure marine vessels. The NMEA OneNet® working group is developing a new standard (now in beta test phase) designed to work hand-in-hand with NMEA 2000 and allow its data to be shared safely over Ethernet.
It was originally released in 1983 and is still being actively updated on a regular basis more than 30 years later. NMEA 2000 was the second international standard released by the NMEA in 2001.
The first international interfacing standard released by the NMEA that is still in use and recognised today is NMEA 0183. Its aim is to strengthen relationships between manufacturers in the marine industry and make it easier for marine electronics devices to share data with one another. The NMEA (National Marine Electronics Association) is a ‘not for profit’ organisation based in the USA.
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