Nmea Message Formats; Symbols Used For Describing The Nmea Formats - Leica Captivate Technical Reference Manual

Appendix E
E.1
Description
Access
☞
E.2
Description
Header

NMEA Message Formats

NMEA Message Formats
Overview
National Marine Electronics Association is a standard for interfacing marine
electronic devices. This chapter describes all NMEA-0183 messages which can
be output by the instrument.
Step Description
1. Select Leica Captivate - Home: Settings\Connections\All other
connections\NMEA 1 or NMEA 2.
2. Press Edit.
3. Check Stream NMEA messages from the GS sensor.
4. Press Messages.
A Talker ID appears at the beginning of the header of each NMEA message.
The Talker ID can be user defined or standard (based on the NMEA 3.0). The
standard is normally GP for GPS but can be changed in NMEA Output 1 or
NMEA Output 2.

Symbols Used for Describing the NMEA Formats

NMEA messages consist of various fields. The fields are:
Header
•
• Special format fields
Numeric value fields
•
Information fields
•
• Null fields
Certain symbols are used as identifier for the field types.
These symbols are described in this section.
Symbol Field
$ -
--ccc Address
Description
Start of sentence
-- = alphanumeric charac-
•
ters identifying the talker
Options:
GN = Global Navigation
Satellite System
GP = GPS only
GL = GLONASS
GA = Galileo
BD = BeiDou
Example
$
GNGGA
GPGGA
GLGGA
GAGGA
BDGGA
1013