Output Messages > NMEA-0183 Messages > Overview

NMEA-0183 messages: Overview

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When NMEA-0183 output is enabled, a subset of NMEA-0183 messages can be output to external instruments and equipment connected to the receiver serial ports. These NMEA-0183 messages let external devices use selected data collected or computed by the GNSS receiver.

All messages conform to the NMEA-0183 version 3.01 format. All begin with $ and end with a carriage return and a line feed. Data fields follow comma (,) delimiters and are variable in length. Null fields still follow comma (,) delimiters, but contain no information.

An asterisk (*) delimiter and checksum value follow the last field of data contained in an NMEA-0183 message. The checksum is the 8-bit exclusive of all characters in the message, including the commas between fields, but not including the $ and asterisk delimiters. The hexadecimal result is converted to two ASCII characters (0–9, A–F). The most significant character appears first.

The following table summarizes the set of NMEA messages supported by the receiver, and shows the page that contains detailed information about each message.

Message Function
ADV Position and satellite information for RTK network operations
DTM Datum reference information
GBS GNSS satellite fault detection (RAIM support)
GGA Time, position, and fix related data
GLL Position data: position fix, time of position fix, and status
GNS GNS Fix data
GRS GRS range residuals
GSA GPS DOP and active satellites
GST Position error statistics
GSV Number of SVs in view, PRN, elevation, azimuth, and SNR
HDT Heading from True North
LLQ Leica local position and quality
PFUGDP A proprietary message containing information about the type of positioning system, position, number of satellites and position statistics
PTNL,AVR Time, yaw, tilt, range, mode, PDOP, and number of SVs for Moving Baseline RTK
PTNL,BPQ Base station position and position quality indicator
PTNL,DG L-band corrections and beacon signal strength and related information
PTNL,GGK Time, position, position type, and DOP values
PTNL,PJK Time, position, position type, and DOP values
PTNL,PJT Projection type
PTNL,VGK Time, locator vector, type, and DOP values
PTNL,VHD Heading Information
RMC Position, Velocity, and Time
ROT Rate of turn
VTG Actual track made good and speed over ground
ZDA UTC day, month, and year, and local time zone offset

To enable or disable the output of individual NMEA messages, do one of the following:

Note – The position output by the receiver is the Antenna Phase Center position. You may want to reduce this position to a reference position elsewhere. If so, you should account for any tilt of the antenna in such a reduction. The settings for the Antenna Measurement Method and Antenna Height are not applied to the position outputs.

For a copy of the NMEA-0183 Standard, go to the National Marine Electronics Association website at www.nmea.org.