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A temporary `gnss probe` command listens on both pin orders at 115200 and 9600. Only RX 15 / TX 13 at 115200 carries NMEA, as Meshtastic's board file says; M5Stack's GPIO 8/9 are the keyboard's I2C bus. The output format (NMEA 4.10, GSA system IDs, GSV per signal) is recorded in docs/milestones/M2.md. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT