Chapter 4
44 Phoenix 300 Installation & Operation Manual
National Marine Electronics Association (NMEA) Messages
The Phoenix 300 receiver can be used to communicate with other electronic devices including a Raven light
bar or field computer. The Phoenix 300 conforms to the communication protocol (set of rules) known as the
NMEA-0183 standard established by the National Marine Electronics Association. The NMEA-0183 standard
contains numerous message formats such as the ones described below, which the Phoenix 300 receiver uses
with other devices to send and receive signals.
TABLE 5. NMEA Messages
Message Type Description
ALM Satellite Almanac Data
GGA Global Positioning System Fix Data
GLL Longitude and Latitude of Current Position
GRS Range Residuals
GSA GPS DOP and Active Satellites
GST Pseudo Range Measurement Noise Stats
GSV Satellites in View and SNR (Signal Noise Ratio) values
RMC Recommended Minimum Specific GPS/Transit Data
VTG Course Over Ground and Ground Speed
ZDA Time and Date
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