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add an existing projection to the drop down list

Question asked by WalterWitt on Apr 21, 2017
Latest reply on Apr 27, 2017 by MKennedy-esristaff

I am embarking on a new project that is located in Finland and the data in the project folder are projected in Finnish KKJ_Zone 4 [EPSG2394].

The Arc dropdown box lists two projections for Finland under Projected Coordinate Systems/National Grids: KKJ Finland Zone 0 and KKJ Finland Zone 5 (but no Zone 4).

Is there a simple way to add KKJ Finland Zone 4 to the list of selectable projections? or do I have to define the projection myself?

I am using Arc 9.3.1 and Windows 8.