Nmea 4.11 |verified| -

$PROMT,1,ROLL,-3.4,D,CRIT*2A

$GNMRK,1,2,1,gyro_checksum_fail,6*3C

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.