How can I setup a new datum for a new coordinate system

Hi

I need to define a new coordinate system to add to the Geographic Coordinate systems.

There is no problem in defining the projection, which just another Transvers Mercator, the problem is that I need to define a new Datum

How do I do that ?. As far as I can see I can only chose among the allready defined datums. Are there a possibility for adding a new datum ??

Why do I need a new Datum! Because the Fixed Link across the Fehmarn Belt between Denmark and Germany has decided to use ITRF2005 as Datum for it project coordinate system. And since ETRS89 differs around 20 centimeters from ITRF2005, we need to have a simple datum transformation between these two datums allthough they both are 'WGS84' datums

Thanks

Erik Wirring

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