Hi Marko,

When I use say Leica Geo Office, I get normal transformation parameters of 2-3 cm.

The different is the functional model. Most applications use a simplified functional model treating only the coordinates of the target system as observations. In JAG3D's CoordTrans both, the coordinates of the source and the target system, are treated as observations. CoordTrans addresses the most general case. So if you compare your results with other applications, make sure that all applications use identical algorithms.

/Micha