Where the subscription to /fix message is defined?

[zlg9folira]

I am trying to use this plugin on a rosbag containing /gps and /fix topics of the types gps_common/GPSFix and sensor_msgs/NavSatFix, respectively. However, I can't find anywhere within the code scripts that the NH subscribes to any of these (in README.md was said that the plugin subscribes to sensor_msgs/NavSatFi).

I was able to see there is only one subscription (in scripts/nmea_topic_driver.py) where an nmea_msgs/Sentence is the type of the message to which the code subscribes.

I am not able to make some output due to that, I'd appreciate your help.