NMEA 4.10 added the signal identifier (aka “signal ID”) to distinguish between different signals from GNSS.
Signal identifiers are only valid when combined with a GNSS system identifier.
Signal ID was added to the following messages in NMEA 4.10:
| Message ID | Description |
|---|---|
| GBS | GNSS Satellite Fault Detection |
| GRS | GNSS Residuals |
| GSA * | GNSS Active Satellites |
| GSV | GNSS Satellites in View |
Notes:
A decent list of signal identifiers can be found in NMEA Revealed - NMEA 4.11 System ID and Signal ID.