There is no IAS to CAS correction capability in SkyView, or any other name brand EFIS that I know of, because IAS and CAS should be within a few knots of each other. I hate to say this but it sounds like your system has a dynamic airflow error which makes wind, altitude and other calculations wrong. Not that uncommon with EAB aircraft. I had this same situation in my airplane.Sorry. That was not my question. My system has no errors. I only want to have correct values.
Not if the pitot/static system is providing the EFIS with a wrong IAS value. In a modern EFIS, TAS is calculated based on IAS, among other variables, so a wrong IAS will give a wrong TAS. "Garbage in, garbage out."In zero wind flight, TAS will match ground speed.