Abstract: A surveying system comprising a global coordinate measuring device (CMD) and a local CMD, wherein the local CMD is configured to coordinatively survey surface survey an object. The surveying system has a coordinate transformation functionality, during the execution of which a first transformation of the local coordinate system of the local CMD into the global coordinate system of the global CMD takes place, whereby at least three reference points, the respective defined position of which is known to either the global or the local CMD, are surveyed by the respective other CMD. A second transformation of the global coordinate system into the object-side coordinate system also takes place, whereby the global CMD surveys at least three support points, the respective defined position of which in the object-side coordinate system is known.