If I can't get the gps or gazebo_modelstaes/pose

[slashzyz]

I want to set the Tag on the UAV, so I have to change the 'gazebo_modestate' to /mavros/local_postion/pose. But the pose is given from GPS. If I can't get the pose,I can't use the pozyx_simulation. So this model is to get the pose,but we have to get the pose first.Then use it to get distance, and get the pose. This is a question?