gpsd-knowledge-patch
gpsd Knowledge Patch
Covers gpsd JSON protocol fields, libgps C client API, and timing interfaces. Claude knows gpsd daemon basics, gpspipe, cgps, and JSON protocol fundamentals, but is unaware of the specific field semantics, deprecations, and API patterns below.
Index
| Topic | Reference | Key content |
|---|---|---|
| TPV message fields | references/tpv-message.md | altHAE/altMSL, status codes, ECEF/NED, float validity |
| Timing & PPS | references/timing-pps.md | TOFF/PPS reports, sawtooth correction, NTP integration |
| Client API (libgps) | references/client-api.md | gps_mainloop(), shared-memory interface, usage patterns |
Essential Quick Reference
ECEF and NED Velocity/Position Fields
TPV can include ECEF (Earth-Centered, Earth-Fixed) coordinates and NED (North-East-Down) components:
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