FAQ: Why are projected layers always displayed in an unprojected coordinate system in the Edit Map page?
Why are projected layers always displayed in an unprojected coordinate system in the Edit Map page?
The ArcWeb site Edit Map page always displays maps using the GCS_WGS_1984 coordinate system, even when the layers contain projected data. Layers displayed in the Edit Map page indicate that the data file's coordinate system is defined properly.
When creating a custom map service, an end user application can request maps in any coordinate system supported by ArcWeb Services.
See the link in the Related Information section for a list of supported coordinate systems.