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Help with coordiante systems

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Hi there,

I wanted to know how to change the geographical coordinate system (GCS) and the projected coordinate system (PCS) of the basemap (Oceans, from Arcgis basemaps?

The problem is I have two layers one (Proj_TH) is using a GCS of Indian 1975 and a PCS under UTM>Indian 1975 47n. The base map (Oceans, from Arc basemaps) however under the View dataframe prop > Co-ordinate system > Current co-ordinate system - indicates that it is yet in WGS though on screen the basemap projects in UTM > Indian 1975 zone 47n.

Why doesn't the info change under the layers in the view frame properties dialogue.

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