I am starting do doubt if anything from nvd_data is fed back to the GPS chip by gpsd. Here is what I did: I refreshed location in the Control Panel -> GPS Location with external LD-3W module, upon which nvd_data and gps_last_saved_report got updated. It took about 1 second (I have good view to the sky). Few minutes after that I switched to internal GPS and tried to refresh location in the Control Panel -> GPS Location. So far it has been searching for more than 10 minutes without getting a lock. Could somebody repeat this experiment?