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In the documentation https://wiki.nps.edu/display/RC/Garmin+GPS18x says that "To interpret the fix message you need to know that it is a message of type NavSatFix."

You look at the structure: http://docs.ros.org/en/api/sensor_msgs/html/msg/NavSatFix.html

So I suggest you look on ways to read NavSatFix messages in ROS, there is a question that might help you as well #q288031