This tool subscribes to the
/run/mpa/vvpx4_gps_raw_int pipe published by voxl-vision-px4 which provides a copy of all GPS_RAW_INT mavlink messages received from a PX4 flight controller.
Also note that voxl-portal subscribes to the same pipe and also shows GPS satellites in the top right corner of the webpage.
yocto:/$ voxl-inspect-gps dt(ms) |fix type|Sats|Latitude(deg)|Longitude(deg)| Alt(m) |Vel(m/s)|HorErr(m)|AltErr(m)| 200.2 | 3D FIX | 5 | 32.9007509 | -117.2223741 | 10.9 | 0.02 | 33.962 | 30.965 |
If no data is displayed, then either voxl-vision-px4 is not running or PX4 is not connected or operating. PX4 may also not be connected to a GPS or configured to enable it.
Source code available on Gitlab.