The definitions of these can be found in the ROS documentation.
Stream ID
Type
Description
/motion/speed
std_msgs/Float64
The current maximum speed the robot is set to travel at. Negative values means the robot intends to travel in reverse. If the value is zero, then the robot will be stopped.
/odometry/filtered
nav_msgs/Odometry
The local fused odometry from all odometry sources, i.e. the best source of locally smooth and consistent odometry.
/gps_rover/fix
sensor_msgs/NavSatFix
The GNSS solution. This will return the GNSS position of the antenna (not the robot center).