Ug-353 Gps Driver Guide

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

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

The UG-353 was wired to UART5 on a Raspberry Pi Compute Module 4. Marta had written a simple systemd service to start gpsd with the correct options: Why ignore them

Marta was a firmware engineer for a small agricultural robotics startup. Her team had just switched from an old U-Blox GPS to the UG-353 (a common, low-cost 10Hz GPS module with a UART interface). The robot’s navigation stack was failing. “No fix,” the logs said. “No fix.”