The phrase typically refers to a specific sentence type within the NMEA 0183 standard (the common protocol for talking to GPS receivers and other marine electronics).
And then Kaelen saw it. Buried inside the fake NMEA strings was a pattern. A hidden message, encoded in the checksum fields: nmea 4.11
If you were looking for information on the NMEA OneNet standard (Version 4.x) or updates to NMEA 2000 , note that the current major version is NMEA 4.10 (released roughly 2023). If you see "4.11" in a changelog or setting, it might be a specific manufacturer's minor firmware revision or a typo for version 4.10, rather than a sentence type. The phrase typically refers to a specific sentence
The city was level. It had always been level. A hidden message, encoded in the checksum fields:
: The GSV (Satellites in View) sentence definition was expanded to support up to 36 satellites per constellation.
Not a treaty or a code of law, but a protocol—the last agreed-upon standard for data exchange between sensors, actuators, and the city’s failing core. NMEA 4.11 was old, clunky, and verbose. It sent sentences like $GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47 through rusting wires. But it was reliable. It was the only thing still speaking to the ancient navigation systems after the Great Static Burn wiped out all wireless comms.