The current version of RenderWorld is in Decimal Degrees (Geodetic) and it is not possible to change the projection. Although, we are working to have in the next version the possibility to have the support for other world projections such as Mercator, Mollweid etc.
It does not make sense to have RenderWorld projected to UTM because only certain regions can be within one zone, not the entire world. But if you have your own data in UTM or in another projection other than Geodetic and you want to have it within RenderWorld. You need to project it to Geodetic, so you need to know the projection info about your data. You can get that from your data provider.