The node can be configured to send position, velocity, and time information at regular intervals to servers that can process the data. When the data is formatted as an ASCII string according to National Marine Electronics Association (NMEA) standards, it is called an NMEA sentence. The node uses an IP transport service to send NMEA sentences to remote hosts. For information about enabling IP transport for NMEA sentences, see the 7705 SAR-Hm and SAR-Hmc Main Configuration Guide, "GNSS NMEA data IP transport service".
NMEA data streaming is enabled on the node when the IP transport ipt-id parameter is configured as gnss and the nmea no shutdown command is issued.
The following NMEA parameters must be configured on the node when streaming is enabled:
sentence-type
sentence-interval
The NMEA defines a number of sentence types for streaming. The node supports the following sentence types:
GGA — this sentence is for time, position, and fix-related data for a GNSS receiver
RMC — this sentence is for time, date, position, course, and speed data provided by the GNSS receiver
VTG — this sentence is for vector track and speed relative to the ground
GNS — this sentence is for time, position, and fix-related data for single or combined constellations for a GNSS receiver.
For information about the sentence types, see NMEA 0183, Standard For Interfacing Marine Electronic Devices.
The sentence interval specifies the frequency with which NMEA sentences are sent from the GNSS receiver. The interval can be set from 1 s to 3600 s. Different sentence types can be enabled concurrently so that multiple sentences can be streamed per sentence interval.