Leica Captivate, Техническое справочное руководство

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Appendix E NMEA Message Formats
E.1 Overview
N ational M arine E lectronics A ssociation 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 .
E.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 Description Example
$ - Start of sentence $
--ccc Address
•
-- = alphanumeric charac-
ters identifying the talker
Options:
GN = G lobal N avigation
S atellite S ystem
GNGGA
GP = GPS only GPGGA
GL = GLONASS GLGGA
GA = Galileo GAGGA
BD = BeiDou BDGGA
Description
Access
☞
Description
Header
NMEA Message Formats 1013