Getting connected

Electronics expert Andy Haines explains why the ubiquitous, low-cost USB system of connectors isn’t well suited for marine interfaces

QUESTION: 'Why are there competing different electronic buses on boating instruments? Surely USB is ubiquitous; faster and effective and ‘universal’? Mike Greenland, Wimborne, Dorset That’s a very good question and it’s not the first time I’ve been asked to explain the different interface protocols used in the marine industry. The good news is that although there are several protocols currently in use, these have come about mainly for historic reasons (more on that later) and over the next few years we’ll see most disappear. These days NMEA 2000 dominates the market for sharing basic navigational data such as position, speed, depth, heading etc. However, this does not include video data, such as chart or radar displays, which requires a faster protocol such as Ethernet. The NMEA 2000 interfacing standard is…

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Practical Boat Owner (Digital) - 1 Issue, August 2020

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