[Users] Carpet moving grids

Hello , I'm trying to test a new version of my thorn which sets up initial data for moving neutron star. And I have couple questions about the Carpet moving grids. I was wondering if you could help answer it or suggest some recent documentation for Carpet which I can refer to? The question is simple: How to move grids in case of the moving neutron star? By looking at bbh parameter file I understood that Carpet gets information about position of the puncture from puncture tracker. Is there any trons which is providing this information in case of a neutron star or I have to write some thorn which is actually will track a center of the neutron star or its surface? Thank you!