- Add GPS dongle support with NMEA parsing (utils/gps.py, routes/gps.py)
- Add GPS device selector to ADS-B and Satellite observer location sections
- Add GPS dongle option to ADS-B dashboard
- Fix Python 3.7/3.8 compatibility by adding 'from __future__ import annotations'
to all SDR module files (fixes TypeError: 'type' object is not subscriptable)
- Add pyserial to requirements.txt
- Update README with GPS dongle documentation and troubleshooting
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>