Use the Coordinate System Library to view coordinate systems, datums, ellipsoids, geodetic transformations and geodetic transformation paths. You can assign a coordinate system from within the library, and you can edit and delete any user-defined items in the library.
Enter a search term to filter the list (for example a country or region). Enter characters contained in the code, description, or category name you want. For example, enter "can" to highlight Canada, Cancun, and Cape Canaveral.
Referenced To: The name of the datum or ellipsoid to which the item is referenced. Where more than one datum is referenced (for example, target and source datum), each datum is on a separate line. For arbitrary coordinate systems, ellipsoids, and geodetic paths (which are not referenced), the field will be blank.