working now with wifi HTTP server to pull down log files; TODO get real time at start-up for log names, fix RTC if batteries need replacement, adopt ChatGPT recommendations. Consider higher precision time?

exercises/18_GPS_Field_QA/README.md

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+## Exercise 18: GPS Field QA
+
+Survey/reconnaissance firmware for LilyGO T-Beam SUPREME.
+
+This exercise measures GNSS visibility and solution quality, logs results to internal flash using CSV, and provides a minimal serial interface for retrieving the logs in the field.
+
+Current storage choice:
+
+- `SPIFFS`
+
+Current environments:
+
+- `bob_l76k`
+- `guy_ublox`
+
+Primary serial commands:
+
+- `status`
+- `summary`
+- `ls`
+- `cat <filename>`
+- `stop`
+- `erase_logs`
+
+Notes:
+
+- Samples are aggregated once per second.
+- Records are flushed to flash every 10 seconds.
+- Satellite snapshot records are written as additional CSV lines when GSV data is available.
+- The implementation uses common NMEA parsing so it can normalize L76K and MAX-M10S output without adding a new GNSS dependency.