Robot localization dual_ekf_navsat example

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I'm assuming you meant to link this:

https://github.com/cra-ros-pkg/robot_...

The short answer is because it doesn't need to. The robot's estimate of where it is in its own map coordinate frame doesn't require any kind of earth-referenced heading. navsat_transform_node needs it, but the EKF doesn't care. Magnetometers are notoriously erroneous, e.g., near metal, so I tend to leave it out. But if you prefer to fuse it, you can.