gpsd: gpsd: command socket at /var/run/gpsd.sock gpsd: device /dev/ttyAMA5 is a UG-353 (NMEA) gpsd: no fix: no GPS signal But the UG-353 was outputting valid GGA sentences with a 3D fix. Why ignore them? She realized the UG-353 outputs , but gpsd ’s autobaud logic was misreading the sentence interval as corrupted data. She forced the baud rate and enabled raw NMEA mode :
dtoverlay=uart5,uart5_rx_pullup=on
Still no fix in gpsd . Marta ran gpsd -N -n -D 5 /dev/ttyAMA5 (foreground, debug mode). The debug output revealed: ug-353 gps driver
sudo gpsd /dev/ttyAMA5 -F /var/run/gpsd.sock But cgps showed a blank screen. Zero satellites. Sky was clear. gpsd: gpsd: command socket at /var/run/gpsd
stty -F /dev/ttyAMA5 9600 cs8 -cstopb -parenb Now cat /dev/ttyAMA5 showed garbage. Good—data was flowing. She forced the baud rate and enabled raw
Now $GPGGA sentences appeared cleanly.
The Silent NMEA Sentence