If the vessel owner has an instrument that ideally requires the data output of two or more devices, for example a chart plotter, then the owner has no alternative but to settle on connecting only the most important device, usually the GPS. Unfortunately, there is one very large drawback with this standard – only one device on a connected network can actually send data (a single ‘talker’ device), with multiple devices (determined by the current limit of the sending unit) listening to that data (multiple listeners). The NMEA 0183 standard allows any suitably designed marine electronic device to share its gathered information with any other device on a vessel.
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