How to understand these parameters in GPS API?

[MJy1023]

enum GnssFixType : unsigned char

enum PositionCovarianceType : unsigned charenum

NavSatStatusServiceType : unsigned short int

[alonfaraj]

Hi @Jason-M1024,
The gps api follows ROS NavSatFix message type.
You can find the explanation for each field in its documentation:
http://docs.ros.org/en/lunar/api/sensor_msgs/html/msg/NavSatFix.html

[MJy1023]

Thanks a lot!