I used the ZED camera to generate a visual odometry message. While collecting the ROS bag, I forgot to set a param in ZED that turns off publishing the odom -> base_link transform. However while collecting the ROS bag, I didn't collect the /tf or tf/static topic at all. Yet, the navsat transform node publishes zero values for odometry/gps. I already have launch a all necessary transforms (imu, GPS and ZED cam in a urdf file) so that does not seem to be the issue.