If only "raw" data is provided it is one box that provides unfiltered and unupdated attitude, accelerometer and GPS data. The GPS does not need to update the IRS portion for that.
On Boeings there is no internal GPS updating in the ADIRUs and they come right of the box GLS and RNP 0.1 approved and equipped. Our A320/A330s come right out of the box only RNP 0.3 and not GLS approved and equipped. We could equip them for both, GLS costs are over a million $ per unit and the upgrade to RNP 0.1 on A320s cost around 300k to 500k $ per unit.