11-3
1 Introduction
1.1 General
The purpose of this document is to define the most common serial messages that are used by
JRC speed logs, voyage data recorders and interface units as well as specify the hardware
used for serial communication.
The document is intended to be used as a sub-document to operator manuals.
1.2 References
x IEC 61162-1 / NMEA 0183 standard.
x IEC 61162-2 / NMEA 0183 (HS) standard.
1.3 Background
The National Marine Electronics Association (NMEA) has developed a specification that
defines the interface between marine electronic equipments called NMEA 0183. This
standard is closely aligned with the standard IEC 61162-1 from International Electrotechnical
Commission (IEC) which is specified by International Maritime Organization (IMO) to meet
the International convention for the Safety of Life at Sea (SOLAS) regulations.
In this document, we refer to this standard as IEC 61162-1/NMEA or IEC 61162-2/NMEA
for the high speed version of the same standard.
The idea of IEC 61162/NMEA is to send a line of data called a sentence that is self-contained
and independent from other sentences. There are standard sentences for each device category
and a capability exist to define own / proprietary sentences for use by manufacturers.
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