2050
User Guide
Appendix D: NMEA Data Output Message Formats
C-Nav[2050] GPS Receiver communicates via an RS232 serial interface and provides
National Marine Electronics Association (NMEA 0183) compatible, ASCII text sentence,
messages.
This appendix only describes the NMEA 0183 sentences that are provided by the C-
Nav[2050] GPS Receiver. For a complete guide to the NMEA standard and sentence
formats, see the National Marine Electronics Association 0183 Standard for Interfacing
Marine Electronics.
The NMEA 0183 Standard defines electrical signal requirements, data transmission
protocol, timing and specific sentence formats for up to 38.4K baud for a serial interface
data bus.
NMEA 0183 sentences are ASCII text information with each field (or parameter) separated
by a comma (i.e.: comma-delimited text format).
The following outlines the format of the NMEA sentence structure:
The basic format for an NMEA-0183 sentence (or message) is...
$
[ADDRESS_FIELD][
,
DATA_FIELD][
*
CHECK_SUM][
CRLF
]
where the message elements are defined as...
All NMEA 0183 messages start with the ‘
$
’ (dollar) character
All field separators start with the ‘
,
’ (comma) character
The check-sum field starts with the ‘
*
’ (asterisk) character
The NMEA 0183 message is terminated by the
CRLF
character pair – 0xOD and
0xOA
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