I can't get the grid to start at 0-0.  I first created a new UCS and moved the origin.  That didn't work.  I reverted to the World, selected everything and used the Esnaps to choose an entity as the base point to move everything to the world origin.  That entity queries as at -0, but the grid does not originate there.  Because the grid is off, the snaps are also off.

This drawing in a Gerber (PCB) file converted to DXF and imported into DS.

Thanks.